Businessman speaking on a mobile telephone

Businessman speaking on a mobile telephone

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Credit: JESSE/SCIENCE PHOTO LIBRARY

Caption: Mobile telephone. Businessman looking at his wrist watch while speaking on a cellular or mobile telephone outdoors. These telephones use low-power radio signals to transmit calls to a base station in the user's local area, or cell. A wide range of frequencies can be used in each cell because the signals are too weak to interfere with those in other cells. Base stations relay calls by cable to switching centres, from where calls can be transferred to other base stations, to the conventional telephone exchange, or to satellite stations for international calls.

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Keywords: businessman, cellphone, cellular, cellular telephone, communication, communications, communications technology, man, mobile, mobile phone, mobile telephone, technological communication, telephone, use

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