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In 1908, U.S. Patent 887,357 for a wireless phone was issued in to Nathan B. Stubblefield of Murray, Kentucky. He applied this patent to "cave radio" telephones and not without delay to cellular telephony as the term is at present accepted. Cells for mobile phone base stations were invented in 1947 by Bell Laboratories engineers at AT&T and further developed by Bell Labs during the 1960s. Radiophones have a long and sundry history going back to Reginald Fessenden's invention and shore-to-ship demonstration of radio telephony, thru the second World War with army use of radio telephony links and civil services in the 1950s, while hand-held cellular radio devices have been available since 1973. A patent for the 1st wireless phone as we know today was issued in US Patent Number 3,449,750 to George Sweigert of Euclid, Ohio on June 10, 1969.
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Martin Cooper, a Motorola researcher and executive is widely thought to be the inventor of the first practical mobile phone for hand-held use in a non-vehicle setting. Cooper is the inventor named on "Radio phone system" filed on October seventeen, 1973 with the US Patent Office and later issued as US Patent 3,906,166. Employing a modern, if rather heavy cartable handset, Cooper made the 1st call on a hand-held mobile phone on April 3, 1973 to a rival, Dr. Joel S. Engel of Bell Labs.
In 1983, Motorola DynaTAC was the 1st licensed mobile phone by FCC in the US. In 1984, Bell Laboratories developed modern commercial cellular technology ( based, to a big extent, on the Gladden, Parelman Patent), which employed multiple, centrally controlled base stations ( cell sites ), each providing service to a small area ( a cell ). The cell sites would be set up such that cells partially overlapped. In a cellular system, a signal between a base station (cell site) and a terminal ( telephone ) only need be strong enough to reach between the two, so the same channel can be used simultaneously for separate conversations in different cells.
Until the early 1990s, following arrival of the Motorola MicroTAC, most mobile telephones were too massive to be carried in a jacket pocket, so they were generally installed in automobiles as vehicle telephones. With the miniaturization of digital elements and the development of more sophisticated batteries, mobile phones have become smaller and lighter.
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