Telephone

:This article is about telephone technology. For the game of telephone, see Telephone (game). For the band, see Téléphone.

Wireless phone systems

Wireless phones systems include Cell phones are the satellite and mobile systems. For non-telephone-network uses see Radio.

Related Topics:
Cell phone - Satellite - Radio

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Mobile phone

Modern mobile phone systems are cell-structured. Radio is used to communicate between a handset and a cell-site. Communication between cell-sites and the public switched telephone network can be by digital microwave radio, digital optic fiber or digital copper land lines communicating with a telephone exchange.

Related Topics:
Mobile phone - Radio - Cell-site - Public switched telephone network - Microwave - Telephone exchange

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When a handset gets too far from a cell-site, a computer system commands the handset and a closer cell-site to take up the communications on a different channel without interrupting the call.

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Modern mobile phones use cells because radio frequencies are a limited, shared resource. Cell-sites and handsets have low power transmitters so that a limited number of radio frequencies can be reused by many callers with less interference. An incidental benefit is that the batteries in the handsets need less power.

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