Cellular telephones, or simply cell phones, are portable devices that may be used in motor vehicles or by pedestrians. Communicating by radio waves, they permit ...
a mobile telephone system using low-powered radio transmitters, with each transmitter covering a distinct geographical area (cell), and computer equipment ...
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2017年1月5日 — A cellular phone is a telecommunication device that uses radio waves over a networked area (cells) and is served through a cell site or base ...
A mobile phone (or cellphone) is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a ...
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