document_title: When Calls the Heart

question_text: who plays jack's mother on when calls the heart

question_tokens: who plays jack 's mother on when calls the heart

text: When Calls the Heart

text: Plot[edit]

text: When Calls the Heart tells the story of Elizabeth Thatcher (Erin Krakow), a young teacher accustomed to her high-society life. She receives her first classroom assignment in Coal Valley, a small coal-mining town in Western Canada which is located just south of Robb, Alberta. There, life is simple—but often fraught with challenges. Elizabeth charms most everyone in Coal Valley, except Royal North West Mounted Police Constable Jack Thornton (Daniel Lissing). He believes Thatcher’s wealthy father has doomed the lawman's career by insisting he be assigned in town to protect the shipping magnate’s daughter. The town of Coal Valley was renamed Hope Valley in Episode 2, Season 2 after the coal mine was closed.

text: Living in this 1910 coal town, Elizabeth must learn the ways of the Canadian frontier movement if she wishes to thrive in the rural west on her own. Lori Loughlin portrays Abigail Stanton, whose husband, the foreman of the mine, and her only son—along with 45 other miners—have recently been killed in an explosion, which turns out to have been a tragic accident waiting to happen—a result of the mining-company site manager's irresponsible management and lack of due care in his management of the mine. The newly widowed women find their faith tested when they must go to work in the mine to keep a roof over their heads, food on the table, and compile a wage for the town's teacher.[9]

text: Episodes[edit]

text:
Season
Episodes
Originally aired

First aired
Last aired

1
12
January 11, 2014 (2014-01-11)
March 29, 2014 (2014-03-29)

2
7
April 25, 2015 (2015-04-25)
June 13, 2015 (2015-06-13)

New Year's Wish
December 26, 2015 (2015-12-26)

3
8
February 21, 2016 (2016-02-21)
April 10, 2016 (2016-04-10)

Christmas
December 25, 2016 (2016-12-25)

4
10
February 19, 2017 (2017-02-19)
April 23, 2017 (2017-04-23)

The Christmas Wishing Tree
December 25, 2017 (2017-12-25)

5
10
February 18, 2018 (2018-02-18)
April 22, 2018 (2018-04-22)

text: As of March 25, 2018, 46 episodes of When Calls the Heart have aired.

text: Production[edit]

text: The series, originally planned to be filmed in Colorado, is filmed south of Vancouver, British Columbia, on a farm surrounded by vineyards. The fictional frontier town of Coal Valley was erected in late 2013. Some of the set trimmings and a stage coach came from the Hell on Wheels set.[10] The Thatcher home is the University Women's Club of Vancouver.[11]

text: The series was renewed for a second season,[12] which aired from April 25 to June 13, 2015. Hallmark Channel announced in July 2015 that the series had been renewed for a third season, which aired from February 21 to April 10, 2016,[13] with a sneak peek airing during the 2015 Christmas season.[14]

text: In mid-2016, it was announced that Season 4 would premiere on the Hallmark Channel Christmas Day with a two-hour special. On April 11, 2016, Lissing and Krakow announced via the series' Facebook page that Hallmark Channel had renewed the series for a fourth season, which aired from February 19 to April 23, 2017.[15][16]

text: Filming for season five began in Vancouver on August 22, 2017, and ended on December 21, 2017.[17][18]

text: Cast[edit]

text: Main cast[edit]

text:
Erin Krakow as Elizabeth Thatcher Thornton
Daniel Lissing as Jack Thornton
Lori Loughlin as Abigail Stanton
Jack Wagner as Bill Avery
Martin Cummins as Henry Gowen
Pascale Hutton as Rosemary LeVeaux Coulter
Kavan Smith as Leland Coulter

text: Recurring cast[edit]

text:
Paul Greene as Carson Shepherd
Gracyn Shinyei as Emily Montgomery
Loretta Walsh as Florence Blakeley
Erica Carroll as Dottie Ramsey
Mark Humphrey as Frank Hogan
Johannah Newmarch as Molly Sullivan
Mitchell Kummen as Gabe Montgomery
Logan Williams as Miles Montgomery
Ben Rosenbaum as Hickam
Carter Ryan Evancic as Cody Hastings
Chelah Horsdal as Cat Montgomery
Steve Bacic as Charles Spurlock
Kristina Wagner as Nora Avery
Aren Buchholz as Jesse Flynn
Charlotte Hegele as Julie Thatcher
Andrea Brooks as Faith Carter
Eva Bourne as Clara Stanton
Ava Grace Cooper as Opal
Max Lloyd-Jones as Tom Thornton
Brooke Shields as Charlotte Thornton
Devon Weigel as Viola Thatcher
Marcus Rosner as Charles Kensington
Mamie Laverock as Rosaleen Sullivan
Adrian Hough as Reverend Anderson
Lynda Boyd as Grace Thatcher
Will Verchere-Gopaulsingh as Caleb Dunbar
Ali Skovbye as Becky Hastings
Garwin Sanford as William Thatcher
Laura Bertram as Mary Dunbar
Derek Hamilton as Dewitt Graves
Niall Matter as Shane Cantrell (season 4)
Spencer Drever as Cyrus Rivera (season 4)

text: Characters[edit]

text:
Elizabeth Thatcher Thornton is an independent, strong-minded, passionate and dedicated young teacher from the city. The middle daughter of William and Grace Thatcher, Elizabeth has two sisters, older sister Viola and younger sister Julie. Elizabeth finds herself in Coal Valley, a small community on the Canadian frontier in need of a teacher, and quickly discovers it is not an easy place to live, lacking the creature comforts and luxuries of her privileged life with her family. She soon meets the newly appointed and charismatic Mountie Jack Thornton and develops an immediate dislike for him. However, over time they become good friends, and develop an obvious attraction to one another. In the final episode of season 1, "Prelude to a Kiss," (also titled as "Final Adieu"), after overcoming many obstacles throughout the season, Jack tells Elizabeth, "You're the one, you're the only one" and they share a kiss. Throughout season 2, Elizabeth's feelings for Jack are high at times as well as low. Finally, in the season 2 finale, she admits that his job as a Mountie scares her. After being comforted both admitting that they love each other, Jack and Elizabeth kiss.
Jack Thornton is a laid back country boy. Jack is the son of Mountie Thomas Thornton and his wife Charlotte Thornton. Jack has a younger brother, Tom (named after his father). As a Mountie and a man of stout character and integrity, he often finds himself protecting and saving people. In season 1's "A Telling Silence," Jack finds a basset hound whom he names Rip (after Rip Van Winkle) and takes home with him. A source of comfort and companion in the small town, Jack often goes to Rip when times in his life are difficult. In season 2's "With All My Heart," Rip, who's afraid of thunder, hides in the mine shafts during a storm. Jack and Elizabeth search for him; in their search, their relationship grows stronger. Upon his first meeting of Elizabeth, he developed an instant dislike and it appeared she irritated him. However, he grew to like and then fall madly and completely in love with her over time. In "Rules of Engagement" (S.1), it is revealed that Jack was briefly engaged to Rosemary LeVeaux when she comes looking for him. However, they have both changed and realize that they cannot have a relationship as they once did ever again. In "Prelude to a Kiss" (S.1), Jack found out that Elizabeth may be leaving Coal Valley. Taking her on a walk and giving her a framed picture of them that he had sketched, he asks her not to leave Coal Valley and tells her, "You're the one, you're the only one." She replied that she was "not going anywhere", Coal Valley was where she belonged before they share a kiss. In season 2, Elizabeth and Jack share a hot-and-cold relationship until the finale, "With All My Heart." They both admit that they love each other and share another kiss. Jack's brother, Tom, is introduced season 2's "Trials of the Heart," and their rocky relationship continues until "Coming Together, Coming Apart." Jack gently reminds his younger brother how their father was so proud of him, but he wouldn't be proud of the way he was currently living. Both in tears, Jack tells his younger brother that he believes in him and that he can turn his life around. More recently, Jack has become good friends with the sawmill operator, Lee Coulter. In season 3, Jack begins the new year knowing that Elizabeth only has eyes for him and that her relationship with Charles is over for good. In "Hearts In Question," Jack's mother Charlotte shows up unexpectedly. She meets Elizabeth and is suspicious of her, but through staying her sees Elizabeth for who she really is: a trustworthy, dedicated teacher. In the season finale, "Prayers From The Heart," Jack is injured in a flood. But he miraculously recovers in time to serve as Lee's best man at his wedding.
Abigail Stanton is a Coal Valley woman who tragically lost her husband and son in the mining accident. Abigail is a very kind woman, and she stands strongly for the things she believes in. She is one of the first women to welcome Elizabeth and the two women quickly become friends. When Elizabeth accidentally burns down the little teacherage, Abigail gladly welcomes her into her home to live. After being complimented on her cooking, Abigail decides to open a cafe in Coal Valley. Together, Abigail and Elizabeth move into the rooms above the cafe. At the end of season 1, Abigail enjoys the company of Bill Avery, a Mountie, serving as a Forensic Investigator and friend of Jack Thornton's. In season 2, Abigail takes in her daughter-in-law, Clara, the wife of her late son Peter whom Abigail sees as the daughter she never had. With Bill's past being revealed, Abigail ends their friendship and spends more time with the new pastor, Frank Hogan. Also, she is a strong independent woman that is set on doing the things that are right and tries to help Elizabeth.
Bill Avery is a mysterious, quiet man. He first appears in season 1's "Rules of Engagement," in order to help Jack expose Mr. Gowen's wrongdoings. Bill is immediately attracted to widow Abigail Stanton. Things are going well until Abigail discovers a picture of Bill's family and his wedding ring. He later tells her that his son died, as well as his wife. However, his wife, Nora, comes to confront him in season 2's "Heart's Desire."
Henry Gowen is a cold, cynical man who formerly owned the coal mine. After the mine was shut down, Henry became the mayor of Hope Valley and still creates a cold, cynical presence whenever people are around him. Henry is highly disliked and feared in the town. He frequently uses bribery to get what he wants, which is never for the good of the town.
Rosemary "Rosie" LeVeaux Coulter is a flamboyant, enthusiastic actress from New York. She was briefly engaged to Jack Thornton, but they both realized that it wouldn't work out. Rosie immediately disliked Elizabeth and viewed her as "the competition," but eventually came to really care about Elizabeth, even if she has a hard time showing it. At the beginning of season 2, Rosemary began working at the cafe with Abigail and the two quickly became friends. Spending time with Abigail helped tone down some of Rosemary's enthusiasm and made her a more likable person. Rosemary even came to like Elizabeth, even if only on an acquaintance level. Truthfully, she cares about everyone in Hope Valley, especially Lee, with whom she shares an mutual attraction. When Rosie is not spending time with Lee, talking to Abigail, or dreaming about the glamorous life of an actress, she can often be found somewhere writing her weekly advice column for Hope Valley's newspaper! In season 3, Rosemary's friendship with Elizabeth deepened. Instead of viewing her as an adversary, she finds a friend in Elizabeth. Throughout season 3, Rosemary's relationship with Lee becomes more romantic. In "Heart Of A Hero," seeing that Lee needs to spend more time at the sawmill to help the new settlers find jobs, Rosemary tells Lee that the theatre doesn't have to be built. He insists, but she says how important his job is. He smiles and tells her he will one day build her theatre, telling her that she is "the best part of his life." The couple shares in their first kiss. In "A Gentle Heart," Lee is injured. Thinking he is asleep, Rosemary pours out her heart to him, telling how much she loves him. In "Heartbreak," Rosemary is offered a job in Hollywood filming. This has always been Rosemary's dream, to be an actress. Lee unselfishly tells her to do whatever she feels best, but it is obvious that the thought of her leaving Hope Valley hurts him. Rosemary considers her options and realizes that her place is in Hope Valley, with Lee. Lee then tells her that he has another "role" that he thinks would be perfect for her and proposes marriage. She happily accepts. In "Hearts In Question," Rosemary enthusiastically plans for their wedding. The couple weds in the season 3 finale "Prayers From The Heart," with Elizabeth and Abigail as her maids of honor.
Leland "Lee" Coulter is a kind, laidback, patient man who opens a sawmill in Hope Valley. When timber becomes Coal Valley's major source of natural resources, the town is renamed Hope Valley. He shares a mutual attraction to Rosemary and proves to be one of the few people who can outwit her. When she declines his romantic intentions, Lee recruits his friend, Molly Sullivan, to make Rosemary jealous; the ploy succeeds and Rosemary accepts his suit, appreciating Lee's good qualities. Despite her dramatic and occasionally prickly personality, Lee's compassion and patience never fails with her. With Rosemary's help, Lee beat Mr. Gowen at his own game in "Heart and Home." When not at work, Lee enjoys being with friends, including Jack Thornton, who shares Lee's simple and laidback outlook, allowing the men to discuss their lives and exchange romantic advice. In season 3, Lee's mill is unfortunately sabotaged by a man inside. Through Bill and Jack's investigation, they find the culprit. In season 3's "Heart Of A Hero," Rosemary unselfishly gives up the theatre that Lee promised to build her. Lee promises that one day, he will build her the theatre at a time when he isn't so involved with the sawmill and finding people jobs. In "A Gentle Heart," Lee is injured. Thinking Lee is asleep, Rosemary pours out her heart to Lee, telling him how afraid she was when she heard he had been injured. He however hears each and every word. She told him how much she loves him and to never leave her. In the episode "Heartbreak," Lee thinks Rosemary may leave Hope Valley when she is offered a movie job in Hollywood. When she gives up the movie, seeing her future in Hope Valley with him, he asks her to marry him. The couple weds in the season 3 finale, "Prayers From The Heart." Jack serves the role of Lee's best man.
Julie Thatcher is Elizabeth's hopeless romantic younger sister. She often gets herself into sticky situations by falling head over heels for men who aren't quite what they seem. In season 2 she gets involved with Jack's brother Tom, which causes trouble with her family and for Jack and Elizabeth's relationship.
Cat Montgomery is a kind, encouraging woman in Coal Valley. She is a widow and mother of three: Gabe, Miles, and Emily. Cat was one of the first mothers to show kindness to Elizabeth when she first came. She desperately wants her children to remember the good memories of their father as seen by her self-sacrificing acts in "Secrets and Lies." Possessing a great sense of teamwork and encouragement, Cat supports the women of Coal Valley while working in the mines in "Cease and Desist." She is good friends with Elizabeth and Abigail. In "These Games," she also helps Jack catch a thief.
Florence Blakeley is a feisty gossip in Hope Valley. She often has a pessimistic perspective and always seems to find the negative, even in a very positive situation. In "Heart and Home," Abigail told Florence what she really thought about her, which causes Florence to rein in her negativity somewhat, though she remains fairly outspoken. While not always likable, Florence adds spice to life in Hope Valley.
Molly Sullivan is a friend of Lee Coulter and Elizabeth Thatcher. Molly's husband was killed in the mine disaster. She has a daughter Rosaleen. In season 1's "A Telling Silence," Rosaleen has trouble in school because she misses her father so much. When she runs away, Elizabeth finds her in the mine, feeling guilty that she didn't bring her father his lunch the day of the disaster because she wanted to play with a friend instead. She fears her mother will blame her, but Elizabeth convinces her that Molly will "say that she loves her more than life itself." Molly is reunited with her daughter, to the joy of the town's people. In season 2's "With All My Heart," Lee feels it's time to "play hard to get" with Rosemary, so he enlists help from Molly. She pretends to be interested in him romantically. This ploy works and Rosemary admits that she does in fact like him. Molly is a kind woman and was among the first to welcome Elizabeth to town.
Clara Stanton is the wife of Abigail's late son Peter, and is a sweet, quiet, and sensitive young woman. Abigail never knew she had a daughter-in-law until season 2's "Trials of the Heart;" with Peter having married Clara only three days before he was killed. In "Heart's Desire," Abigail invites Clara to come live with her in Hope Valley, an offer that Clara accepts.
Charles Kensington III is an old friend of Elizabeth with whom she reconnects while in Hamilton. He is interested in her, though her feelings for Jack get in the way of their relationship.

text: Broadcast[edit]

text: The first season of the series was subsequently picked up by CBC Television for rebroadcast as a summer series in 2015.[19] The network has since aired the second and third seasons.[20][21] The series became available internationally on Netflix in August 2017.


document_title: Allostatic load

question_text: who created the theory of allostasis and the body’s response to chronic stressors

question_tokens: who created the theory of allostasis and the body 's response to chronic stressors

root

text: Allostatic load

text:
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tag: table

text: Allostatic load is "the wear and tear on the body" that accumulates as an individual is exposed to repeated or chronic stress.[1] It represents the physiological consequences of chronic exposure to fluctuating or heightened neural or neuroendocrine response that results from repeated or chronic stress.[2] The term was coined by McEwen and Stellar in 1993.[3]

tag: p

text: The regulatory model of allostasis claims that the brain's primary role as an organ is the predictive regulation of internal sensations.[4] Predictive regulation refers to the brain's ability to anticipate needs and prepare to fulfill them before they arise.[4] Therefore, in this model, the brain is responsible for efficient interoceptive regulation. Part of efficient regulation is the mitigation of uncertainty. Humans naturally do not like feeling as if surprise is inevitable. Because of this, we constantly strive to reduce the uncertainty of future outcomes, and allostasis helps us do this by anticipating needs and planning how to satisfy them ahead of time.[5] But it takes a significant amount of the brain's energy to do this, and if it fails to resolve the uncertainty, the situation may become chronic and result in the experience of "allostatic load".[5] The concept of allostatic load provides that "the neuroendocrine, cardiovascular, neuroenergetic, and emotional responses become persistently activated so that blood flow turbulences in the coronary and cerebral arteries, high blood pressure, atherogenesis, cognitive dysfunction and depressed mood accelerate disease progression."[5] In other words, all of the long-standing effects of continuously activated stress responses are referred to as allostatic load. And allostatic load can even result in permanently altered brain architecture and systemic pathophysiology.[5] Further, as a result of these physical effects, allostatic load also minimizes an organism's ability to cope with and reduce uncertainty in the future, which cements the entire cycle.[5]

text: Allostatic load is generally measured through a composite index of indicators of cumulative strain on several organs and tissues, primarily biomarkers associated with the neuroendocrine, cardiovascular, immune and metabolic systems.[6] Indices of allostatic load are diverse across studies and are frequently assessed differently, using different biomarkers and different methods of assembling an allostatic load index. Allostatic load is not unique to humans and may be used to evaluate the physiological effects of chronic or frequent stress in non-human primates as well.[6]

text: Reactions[edit]

text: Stress hormones such as epinephrine and cortisol in combination with other stress-mediating physiological agents such as increased myocardial workload, decreased smooth muscle tone in the gastrointestinal tract, and increased coagulation effects have protective and adaptive benefits in the short term, yet can accelerate pathophysiology when they are overproduced or mismanaged; this kind of stress can cause hypertension and lead to heart disease. Constant or even irregular exposure to these hormones can eventually induce illnesses and weaken the body's immune system.[7]

text: Adaptation in the face of stressful situations and stimuli involves activation of neural, neuroendocrine and neuroendocrine-immune mechanisms. This adaptation has been called "allostasis" or "maintaining stability through change", which is an essential component of maintaining homeostasis. The main downstream hormones produced as a result of the stress response, cortisol and epinephrine (adrenaline), have beneficial effects on the body that can become detrimental with excessive activation, such as increased blood pressure and heart rate.

text: The physiological responses involved in the stress response are widely considered adaptive as they are effective at responding to acute threats to survival across many species. However, in environments of chronic or frequent activation of the stress response, such as exposure to violence or trauma, poverty, war, hypoxia, or low rank in a social hierarchy, the stress response constantly disrupts homeostasis resulting in overexertion of physiological systems.

text: Allostatic load can be measured in physiological systems as chemical imbalances in autonomic nervous system, central nervous system, neuroendocrine, and immune system activity as well as perturbations in the diurnal rhythms, and, in some cases, plasticity changes to brain structures.

text: Four conditions that lead to allostatic load are:

text:
Repeated frequency of stress responses to multiple novel stressors
Failure to habituate to repeated stressors of the same kind
Failure to turn off each stress response in a timely manner due to delayed shut down
Inadequate response that leads to compensatory hyperactivity of other mediators

tag: ul

text: The effects of these forms of dysfunctional allostasis cause increased allostatic load and may, over time, lead to the development of disease, sometimes with decompensation of the allostatically controlled problem. Allostatic load effects can be measured in the body. When tabulated in the form of allostatic load indices using sophisticated analytical methods, it gives an indication of cumulative lifetime effects of all types of stress on the body.[7]


document_title: History of mobile phones

question_text: when were cell phones first released to the public

question_tokens: when were cell phones first released to the public

text: History of mobile phones

text: Predecessors[edit]

text: Before the devices existed that are now referred to as mobile phones or cell phones, there were some precursors. In 1908, a Professor Albert Jahnke and the Oakland Transcontinental Aerial Telephone and Power Company claimed to have developed a wireless telephone. They were accused of fraud and the charge was then dropped, but they do not seem to have proceeded with production.[2] Beginning in 1918, the German railroad system tested wireless telephony on military trains between Berlin and Zossen.[3] In 1924, public trials started with telephone connection on trains between Berlin and Hamburg. In 1925, the company Zugtelephonie AG was founded to supply train telephony equipment and, in 1926, telephone service in trains of the Deutsche Reichsbahn and the German mail service on the route between Hamburg and Berlin was approved and offered to first-class travelers.[4]

text: Fiction anticipated the development of real world mobile telephones. In 1906, the English caricaturist Lewis Baumer published a cartoon in Punch magazine entitled "Forecasts for 1907" in which he showed a man and a woman in London's Hyde Park each separately engaged in gambling and dating on wireless telephony equipment.[5] Then, in 1926, the artist Karl Arnold created a visionary cartoon about the use of mobile phones in the street, in the picture "wireless telephony", published in the German satirical magazine Simplicissimus.[6]

text: The Second World War made military use of radio telephony links. Hand-held radio transceivers have been available since the 1940s. Mobile telephones for automobiles became available from some telephone companies in the 1940s. Early devices were bulky, consumed high power, and the network supported only a few simultaneous conversations. Modern cellular networks allow automatic and pervasive use of mobile phones for voice and data communications.

text: In the United States, engineers from Bell Labs began work on a system to allow mobile users to place and receive telephone calls from automobiles, leading to the inauguration of mobile service on 17 June 1946 in St. Louis, Missouri. Shortly after, AT&T offered Mobile Telephone Service. A wide range of mostly incompatible mobile telephone services offered limited coverage area and only a few available channels in urban areas. The introduction of cellular technology, which allowed re-use of frequencies many times in small adjacent areas covered by relatively low powered transmitters, made widespread adoption of mobile telephones economically feasible.

text: In the USSR, Leonid Kupriyanovich, an engineer from Moscow, in 1957-1961 developed and presented a number of experimental pocket-sized communications radio. The weight of one model, presented in 1961, was only 70 g and could fit on a palm.[7][8] However, in the USSR the decision at first to develop the system of the automobile "Altai" phone was made.[9]

text: In 1965, Bulgarian company "Radioelektronika" presented on the Inforga-65 international exhibition in Moscow the mobile automatic phone combined with a base station. Solutions of this phone were based on a system developed by Leonid Kupriyanovich. One base station, connected to one telephone wire line, could serve up to 15 customers.[10]

text: The advances in mobile telephony can be traced in successive generations from the early "0G" services like MTS and its successor Improved Mobile Telephone Service, to first-generation (1G) analog cellular network, second-generation (2G) digital cellular networks, third-generation (3G) broadband data services to the state-of-the-art, fourth-generation (4G) native-IP networks.

text: Early services[edit]

text: MTS[edit]

text: In 1949, AT&T commercialized Mobile Telephone Service. From its start in St. Louis, Missouri, in 1946, AT&T introduced Mobile Telephone Service to one hundred towns and highway corridors by 1948. Mobile Telephone Service was a rarity with only 5,000 customers placing about 30,000 calls each week. Calls were set up manually by an operator and the user had to depress a button on the handset to talk and release the button to listen. The call subscriber equipment weighed about 80 pounds (36 kg)[11]

text: Subscriber growth and revenue generation were hampered by the constraints of the technology. Because only three radio channels were available, only three customers in any given city could make mobile telephone calls at one time.[12] Mobile Telephone Service was expensive, costing 15 USD per month, plus 0.30 to 0.40 USD per local call, equivalent to about 176 USD per month and 3.50 to 4.75 per call in 2012 USD.[11]

text: In the UK, there was also a vehicle-based system called "Post Office Radiophone Service,"[13] which was launched around the city of Manchester in 1959, and although it required callers to speak to an operator, it was possible to be put through to any subscriber in Great Britain. The service was extended to London in 1965 and other major cities in 1972.

text: IMTS[edit]

text: AT&T introduced the first major improvement to mobile telephony in 1965, giving the improved service the obvious name of Improved Mobile Telephone Service. IMTS used additional radio channels, allowing more simultaneous calls in a given geographic area, introduced customer dialing, eliminating manual call setup by an operator, and reduced the size and weight of the subscriber equipment.[11]

text: Despite the capacity improvement offered by IMTS, demand outstripped capacity. In agreement with state regulatory agencies, AT&T limited the service to just 40,000 customers system wide. In New York City, for example, 2,000 customers shared just 12 radio channels and typically had to wait 30 minutes to place a call.[11]

text: Radio Common Carrier[edit]

text: Radio Common Carrier[14] or RCC was a service introduced in the 1960s by independent telephone companies to compete against AT&T's IMTS. RCC systems used paired UHF 454/459 MHz and VHF 152/158 MHz frequencies near those used by IMTS. RCC based services were provided until the 1980s when cellular AMPS systems made RCC equipment obsolete.

text: Some RCC systems were designed to allow customers of adjacent carriers to use their facilities, but equipment used by RCCs did not allow the equivalent of modern "roaming" because technical standards were not uniform. For example, the phone of an Omaha, Nebraska–based RCC service would not be likely to work in Phoenix, Arizona. Roaming was not encouraged, in part, because there was no centralized industry billing database for RCCs. Signaling formats were not standardized. For example, some systems used two-tone sequential paging to alert a mobile of an incoming call. Other systems used DTMF. Some used Secode 2805, which transmitted an interrupted 2805 Hz tone (similar to IMTS signaling) to alert mobiles of an offered call. Some radio equipment used with RCC systems was half-duplex, push-to-talk LOMO equipment such as Motorola hand-helds or RCA 700-series conventional two-way radios. Other vehicular equipment had telephone handsets and rotary dials or pushbutton pads, and operated full duplex like a conventional wired telephone. A few users had full-duplex briefcase telephones (radically advanced for their day)

text: At the end of RCC's existence, industry associations were working on a technical standard that would have allowed roaming, and some mobile users had multiple decoders to enable operation with more than one of the common signaling formats (600/1500, 2805, and Reach). Manual operation was often a fallback for RCC roamers.

text: Other services[edit]

text: In 1969 Penn Central Railroad equipped commuter trains along the 360 kilometres (220 mi) New York-Washington route with special pay phones that allowed passengers to place telephone calls while the train was moving. The system re-used six frequencies in the 450 MHz band in nine sites.[12]

text: In the UK, Channel Islands and elsewhere the "Rabbit" phone system was briefly used, being a hybrid of "cell" base stations and handsets. One major limitation was that you had to be less than 300 feet (closer with buildings) from a base due to power limitations on a portable device. [15][better source needed] With modern technology a similar variant is being considered for Apple's new 4G "smart watch" so they can be used in large events in a broadly similar way to a femtocell.

text: European mobile radio networks[edit]

text: This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (April 2012) (Learn how and when to remove this template message)

text: In Europe, several mutually incompatible mobile radio services were developed.

text: In 1966 Norway had a system called OLT which was manually controlled. Finland's ARP, launched in 1971, was also manual as was the Swedish MTD. All were replaced by the automatic NMT, (Nordic Mobile Telephone) system in the early 1980s.

text: In July 1971 Readycall was introduced in London by Burndept after obtaining a special concession to break the Post Office monopoly to allow selective calling to mobiles of calls from the public telephone system. This system was available to the public for a subscription of £16 month. A year later the service was extended to two other UK towns.[16]

text: West Germany had a network called A-Netz launched in 1952 as the country's first public commercial mobile phone network. In 1972 this was displaced by B-Netz which connected calls automatically.

text: The cellular concept[edit]

text: In December 1947, Douglas H. Ring and W. Rae Young, Bell Labs engineers, proposed hexagonal cells for mobile phones in vehicles.[17] At this stage, the technology to implement these ideas did not exist, nor had the frequencies been allocated. Two decades would pass before Richard H. Frenkiel, Joel S. Engel and Philip T. Porter of Bell Labs expanded the early proposals into a much more detailed system plan. It was Porter who first proposed that the cell towers use the now-familiar directional antennas to reduce interference and increase channel reuse (see picture at right)[18] Porter also invented the dial-then-send method used by all cell phones to reduce wasted channel time.

text: In all these early examples, a mobile phone had to stay within the coverage area serviced by one base station throughout the phone call, i.e. there was no continuity of service as the phones moved through several cell areas. The concepts of frequency reuse and handoff, as well as a number of other concepts that formed the basis of modern cell phone technology, were described in the late 1960s, in papers by Frenkiel and Porter. In 1970 Amos E. Joel, Jr., a Bell Labs engineer,[19] invented a "three-sided trunk circuit" to aid in the "call handoff" process from one cell to another. His patent contained an early description of the Bell Labs cellular concept, but as switching systems became faster, such a circuit became unnecessary and was never implemented in a system.

text: A cellular telephone switching plan was described by Fluhr and Nussbaum in 1973,[20] and a cellular telephone data signaling system was described in hipatitas by Hachenburg et al.[21]

text: Emergence of automated services[edit]

text: The first fully automated mobile phone system for vehicles was launched in Sweden in 1956. Named MTA (Mobiltelefonisystem A), it allowed calls to be made and received in the car using a rotary dial. The car phone could also be paged. Calls from the car were direct dial, whereas incoming calls required an operator to locate the nearest base station to the car. It was developed by Sture Laurén and other engineers at Televerket network operator. Ericsson provided the switchboard while Svenska Radioaktiebolaget (SRA) and Marconi provided the telephones and base station equipment. MTA phones consisted of vacuum tubes and relays, and weighed 40 kilograms (88 lb). In 1962, an upgraded version called Mobile System B (MTB) was introduced. This was a push-button telephone, and used transistors and DTMF signaling to improve its operational reliability. In 1971 the MTD version was launched, opening for several different brands of equipment and gaining commercial success.[22][23] The network remained open until 1983 and still had 600 customers when it closed.

text: In 1958 development began on a similar system for motorists in the USSR.[24] The "Altay" national civil mobile phone service was based on Soviet MRT-1327 standard. The main developers of the Altay system were the Voronezh Science Research Institute of Communications (VNIIS) and the State Specialized Project Institute (GSPI). In 1963 the service started in Moscow, and by 1970 was deployed in 30 cities across the USSR. Versions of the Altay system are still in use today as a trunking system in some parts of Russia.

text: In 1959 a private telephone company in Brewster, Kansas, USA, the S&T Telephone Company, (still in business today) with the use of Motorola Radio Telephone equipment and a private tower facility, offered to the public mobile telephone services in that local area of NW Kansas. This system was a direct dial up service through their local switchboard, and was installed in many private vehicles including grain combines, trucks, and automobiles. For some as yet unknown reason, the system, after being placed online and operated for a very brief time period, was shut down. The management of the company was immediately changed, and the fully operable system and related equipment was immediately dismantled in early 1960, not to be seen again.[citation needed]

text: In 1966, Bulgaria presented the pocket mobile automatic phone RAT-0,5 combined with a base station RATZ-10 (RATC-10) on Interorgtechnika-66 international exhibition. One base station, connected to one telephone wire line, could serve up to six customers ("Radio" magazine, 2, 1967; "Novosti dnya" newsreel, 37, 1966).

text: One of the first successful public commercial mobile phone networks was the ARP network in Finland, launched in 1971. Posthumously, ARP is sometimes viewed as a zero generation (0G) cellular network, being slightly above previous proprietary and limited coverage networks.[citation needed]

text: Handheld mobile phone[edit]

text: Prior to 1973, mobile telephony was limited to phones installed in cars and other vehicles.[19] Motorola was the first company to produce a handheld mobile phone. On April 3, 1973, Martin Cooper, a Motorola researcher and executive, made the first mobile telephone call from handheld subscriber equipment, placing a call to Dr. Joel S. Engel of Bell Labs, his rival.[25][26][27] The prototype handheld phone used by Dr. Cooper weighed 1.1 kilograms (2.4 lb) and measured 23 by 13 by 4.5 centimetres (9.1 by 5.1 by 1.8 in). The prototype offered a talk time of just 30 minutes and took 10 hours to re-charge.[28]

text: John F. Mitchell,[29][30][31] Motorola's chief of portable communication products and Cooper's boss in 1973, played a key role in advancing the development of handheld mobile telephone equipment. Mitchell successfully pushed Motorola to develop wireless communication products that would be small enough to use anywhere and participated in the design of the cellular phone.[32][33]

text: The early generations[edit]

text: Newer technology has been developed and rolled out in a series of waves or generations. The "generation" terminology only became widely used when 3G was launched, but is now used retroactively when referring to the earlier systems.

text: 1G – Analogue cellular[edit]

text: First automatic analogue cellular systems deployed were NTT's system first used in Tokyo in 1979, later spreading to the whole of Japan, and NMT in the Nordic countries in 1981.

text: The first analogue cellular system widely deployed in North America was the Advanced Mobile Phone System (AMPS).[34] It was commercially introduced in the Americas in 13 October 1983, Israel in 1986, and Australia in 1987. AMPS was a pioneering technology that helped drive mass market usage of cellular technology, but it had several serious issues by modern standards. It was unencrypted and easily vulnerable to eavesdropping via a scanner; it was susceptible to cell phone "cloning" and it used a Frequency-division multiple access (FDMA) scheme and required significant amounts of wireless spectrum to support.

text: On 6 March 1983, the DynaTAC 8000X mobile phone launched on the first US 1G network by Ameritech. It cost $100m to develop, and took over a decade to reach the market.[35] The phone had a talk time of just thirty-five minutes and took ten hours to charge. Consumer demand was strong despite the battery life, weight, and low talk time, and waiting lists were in the thousands.[36][37]

text: Many of the iconic early commercial cell phones such as the Motorola DynaTAC Analog AMPS were eventually superseded by Digital AMPS (D-AMPS) in 1990, and AMPS service was shut down by most North American carriers by 2008.

text: In February 1986 Australia launched its Cellular Telephone System by Telecom Australia. Peter Reedman was the first Telecom Customer to be connected on 6 January 1986 along with five other subscribers as test customers prior to the official launch date of 28 February.

text: 2G – Digital cellular[edit]

text: In the 1990s, the 'second generation' mobile phone systems emerged. Two systems competed for supremacy in the global market: the European developed GSM standard and the U.S. developed CDMA standard. These differed from the previous generation by using digital instead of analog transmission, and also fast out-of-band phone-to-network signaling. The rise in mobile phone usage as a result of 2G was explosive and this era also saw the advent of prepaid mobile phones.

text: In 1991 the first GSM network (Radiolinja) launched in Finland. In general the frequencies used by 2G systems in Europe were higher than those in America, though with some overlap. For example, the 900 MHz frequency range was used for both 1G and 2G systems in Europe, so the 1G systems were rapidly closed down to make space for the 2G systems. In America the IS-54 standard was deployed in the same band as AMPS and displaced some of the existing analog channels.

text: In 1993, IBM Simon was introduced. This was possibly the world's first smartphone. It was a mobile phone, pager, fax machine, and PDA all rolled into one. It included a calendar, address book, clock, calculator, notepad, email, and a touchscreen with a QWERTY keyboard.[38] The IBM Simon had a stylus you used to tap the touch screen with. It featured predictive typing that would guess the next characters as you tapped. It had applications, or at least a way to deliver more features by plugging a PCMCIA 1.8 MB memory card into the phone.[39] Coinciding with the introduction of 2G systems was a trend away from the larger "brick" phones toward tiny 100–200 grams (3.5–7.1 oz) hand-held devices. This change was possible not only through technological improvements such as more advanced batteries and more energy-efficient electronics, but also because of the higher density of cell sites to accommodate increasing usage. The latter meant that the average distance transmission from phone to the base station shortened, leading to increased battery life while on the move.

text: The second generation introduced a new variant of communication called SMS or text messaging. It was initially available only on GSM networks but spread eventually on all digital networks. The first machine-generated SMS message was sent in the UK on 3 December 1992 followed in 1993 by the first person-to-person SMS sent in Finland. The advent of prepaid services in the late 1990s soon made SMS the communication method of choice among the young, a trend which spread across all ages.

text: 2G also introduced the ability to access media content on mobile phones. In 1998 the first downloadable content sold to mobile phones was the ring tone, launched by Finland's Radiolinja (now Elisa). Advertising on the mobile phone first appeared in Finland when a free daily SMS news headline service was launched in 2000, sponsored by advertising.

text: Mobile payments were trialed in 1998 in Finland and Sweden where a mobile phone was used to pay for a Coca-Cola vending machine and car parking. Commercial launches followed in 1999 in Norway. The first commercial payment system to mimic banks and credit cards was launched in the Philippines in 1999 simultaneously by mobile operators Globe and Smart.

text: The first full internet service on mobile phones was introduced by NTT DoCoMo in Japan in 1999.

text: 3G – Mobile broadband[edit]

text: As the use of 2G phones became more widespread and people began to use mobile phones in their daily lives, it became clear that demand for data (such as access to browse the internet) was growing. Further, experience from fixed broadband services showed there would also be an ever-increasing demand for greater data speeds. The 2G technology was nowhere near up to the job, so the industry began to work on the next generation of technology known as 3G. The main technological difference that distinguishes 3G technology from 2G technology is the use of packet switching rather than circuit switching for data transmission.[40] In addition, the standardization process focused on requirements more than technology (2 Mbit/s maximum data rate indoors, 384 kbit/s outdoors, for example).

text: Inevitably this led to many competing standards with different contenders pushing their own technologies, and the vision of a single unified worldwide standard looked far from reality. The standard 2G CDMA networks became 3G compliant with the adoption of Revision A to EV-DO, which made several additions to the protocol while retaining backwards compatibility:

text:
Introduction of several new forward link data rates that increase the maximum burst rate from 2.45 Mbit/s to 3.1 Mbit/s
Protocols that would decrease connection establishment time
Ability for more than one mobile to share the same time slot
Introduction of QoS flags

text: All these were put in place to allow for low latency, low bit rate communications such as VoIP.[41]

text: The first pre-commercial trial network with 3G was launched by NTT DoCoMo in Japan in the Tokyo region in May 2001. NTT DoCoMo launched the first commercial 3G network on 1 October 2001, using the WCDMA technology. In 2002 the first 3G networks on the rival CDMA2000 1xEV-DO technology were launched by SK Telecom and KTF in South Korea, and Monet in the US. Monet has since gone bankrupt. By the end of 2002, the second WCDMA network was launched in Japan by Vodafone KK (now Softbank). European launches of 3G were in Italy and the UK by Three/Hutchison group, on WCDMA. 2003 saw a further eight commercial launches of 3G, six more on WCDMA and two more on the EV-DO standard.

text: During the development of 3G systems, 2.5G systems such as CDMA2000 1x and GPRS were developed as extensions to existing 2G networks. These provide some of the features of 3G without fulfilling the promised high data rates or full range of multimedia services. CDMA2000-1X delivers theoretical maximum data speeds of up to 307 kbit/s. Just beyond these is the EDGE system which in theory covers the requirements for 3G system, but is so narrowly above these that any practical system would be sure to fall short.

text: The high connection speeds of 3G technology enabled a transformation in the industry: for the first time, media streaming of radio (and even television) content to 3G handsets became possible,[42] with companies such as RealNetworks[43] and Disney[44] among the early pioneers in this type of offering.

text: In the mid-2000s (decade), an evolution of 3G technology began to be implemented, namely High-Speed Downlink Packet Access (HSDPA). It is an enhanced 3G (third generation) mobile telephony communications protocol in the High-Speed Packet Access (HSPA) family, also coined 3.5G, 3G+ or turbo 3G, which allows networks based on Universal Mobile Telecommunications System (UMTS) to have higher data transfer speeds and capacity. Current HSDPA deployments support down-link speeds of 1.8, 3.6, 7.2 and 14.0 Mbit/s.

text: By the end of 2007, there were 295 million subscribers on 3G networks worldwide, which reflected 9% of the total worldwide subscriber base. About two thirds of these were on the WCDMA standard and one third on the EV-DO standard. The 3G telecoms services generated over $120 billion of revenues during 2007 and at many markets the majority of new phones activated were 3G phones. In Japan and South Korea the market no longer supplies phones of the second generation.

text: Although mobile phones had long had the ability to access data networks such as the Internet, it was not until the widespread availability of good quality 3G coverage in the mid-2000s (decade) that specialized devices appeared to access the mobile web. The first such devices, known as "dongles", plugged directly into a computer through the USB port. Another new class of device appeared subsequently, the so-called "compact wireless router" such as the Novatel MiFi, which makes 3G Internet connectivity available to multiple computers simultaneously over Wi-Fi, rather than just to a single computer via a USB plug-in.

text: Such devices became especially popular for use with laptop computers due to the added portability they bestow. Consequently, some computer manufacturers started to embed the mobile data function directly into the laptop so a dongle or MiFi wasn't needed. Instead, the SIM card could be inserted directly into the device itself to access the mobile data services. Such 3G-capable laptops became commonly known as "netbooks". Other types of data-aware devices followed in the netbook's footsteps. By the beginning of 2010, E-readers, such as the Amazon Kindle and the Nook from Barnes & Noble, had already become available with embedded wireless Internet, and Apple had announced plans for embedded wireless Internet on its iPad tablet devices later that year.

text: 4G – Native IP networks[edit]

text: By 2009, it had become clear that, at some point, 3G networks would be overwhelmed by the growth of bandwidth-intensive applications like streaming media.[45] Consequently, the industry began looking to data-optimized 4th-generation technologies, with the promise of speed improvements up to 10-fold over existing 3G technologies. The first two commercially available technologies billed as 4G were the WiMAX standard (offered in the U.S. by Sprint) and the LTE standard, first offered in Scandinavia by TeliaSonera.

text: One of the main ways in which 4G differed technologically from 3G was in its elimination of circuit switching, instead employing an all-IP network. Thus, 4G ushered in a treatment of voice calls just like any other type of streaming audio media, utilizing packet switching over Internet, LAN or WAN networks via VoIP.[46]

text: Mobile device charger standards[edit]

text:
USB power standards for mobile charger

Port
Current
Voltage
Power (max)

Micro-USB
500 mA
5 V
2.5 W

1 A
5 V
5 W

2 A
5 V
10 W

Type-C[47]
100 mA to 3 A
5 V
15 W

1.7 A to 3 A
9 V
27 W

1.8 A to 3 A
15 V
45 W

2.25 A to 5 A
20 V
100 W

text: Before a universal charger standard was agreed upon in the late 2000s users needed an adaptor which was often the same brand as their phone to recharge the battery.

text: In China[edit]

text: As of 14 June 2007[update], all new mobile phones applying for a license in China are required to use a USB port as a power port for battery charging.[48][49] This was the first standard to use the convention of shorting D+ and D−.[50]

text: OMTP/GSMA Universal Charging Solution[edit]

text: In September 2007, the Open Mobile Terminal Platform group (a forum of mobile network operators and manufacturers such as Nokia, Samsung, Motorola, Sony Ericsson, and LG) announced that its members had agreed on Micro-USB as the future common connector for mobile devices.[51][52]

text: The GSM Association (GSMA) followed suit on 17 February 2009,[53][53][54][55][56] and on 22 April 2009, this was further endorsed by the CTIA – The Wireless Association,[57] with the International Telecommunication Union (ITU) announcing on 22 October 2009 that it had also embraced the Universal Charging Solution as its "energy-efficient one-charger-fits-all new mobile phone solution," and added: "Based on the Micro-USB interface, UCS chargers will also include a 4-star or higher efficiency rating—up to three times more energy-efficient than an unrated charger."[58]

text: EU smartphone power supply standard[edit]

text: In June 2009, many of the world's largest mobile phone manufacturers signed an EC-sponsored Memorandum of Understanding (MoU), agreeing to make most data-enabled mobile phones marketed in the European Union compatible with a common External Power Supply (common EPS). The EU's common EPS specification (EN 62684:2010) references the USB Battery Charging Specification and is similar to the GSMA/OMTP and Chinese charging solutions.[59][60] In January 2011, the International Electrotechnical Commission (IEC) released its version of the (EU's) common EPS standard as IEC 62684:2011.[61]

text: Satellite mobile[edit]

text: As well as the now-common cellular phone, there is also the very different approach of connecting directly from the handset to an Earth-orbiting satellite. Such mobile phones can be used in remote areas out of reach of wired networks or where construction of a cellular network is uneconomic.

text: The Inmarsat system is the oldest, originally developed in 1979 for safety of life at sea, and uses a series of satellites in geostationary orbits to cover the majority of the globe. Several smaller operators use the same approach with just one or two satellites to provide a regional service. An alternative approach is to use a series of low Earth orbit satellites much closer to Earth. This is the basis of the Iridium and Globalstar satellite phone services.