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In 1908, U.S. Patent 887,357 for a wireless telephone was issued in to Nathan B. Stubblefield of Murray, Kentucky. He applied this patent to "cave radio" phones and not at once to cellular telephony as the term is at present accepted. Cells for mobile telephone base stations were invented in 1947 by Bell Labs engineers at AT&T and further developed by Bell Labs during the 1960s. Radiophones have a long and varied history returning 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 handheld cellular radio devices have been available since 1973. A patent for the first wireless telephone 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 analyst and executive is widely thought to be the inventor of the first practical mobile telephone for hand-held use in a non-vehicle setting. Cooper is the inventor named on "Radio telephone 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 first call on a hand-held mobile telephone on Apr 3rd, 1973 to a rival, Dr. Joel S. Engel of Bell Labs.
In 1983, Motorola DynaTAC was the 1st licensed mobile telephone by FCC in the United States. In 1984, Bell Labs developed modern commercial cellular technology ( based, to an enormous extent, on the Gladden, Parelman Patent), which employed multiple, centrally controlled base stations ( cell sites ), each providing service to a tiny area (a cell). The cell sites would be set up such that cells partly overlapped. In a cellular system, a signal between a base station ( cell site ) and a terminal ( telephone ) only need be tough enough to reach between the two, so the same channel can be employed simultaneously for separate conversations in different cells.
Until the early 1990s, following introduction of the Motorola MicroTAC, most mobile phones were too massive to be carried in a jacket pocket, so they were typically installed in autos as car phones. With the miniaturization of digital elements and the development of more complicated batteries, mobile telephones became smaller and lighter.
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