Cellphone

Cellphone (also known as a mobile phone, cell phone, or hand phone) is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area.

History

The first handheld mobile phone was demonstrated by John F. Mitchell and Martin Cooper of Motorola in 1973, using a handset weighing 2 kilograms (4.4 lbs). In 1983, the DynaTAC 8000x was the first commercially available handheld mobile phone.

Technology

Cellphones are connected to a cellular network, which is an interconnected network of cells, each served by at least one fixed-location transceiver, known as a cell site or base station. When a cellphone is turned on, it communicates with the nearest cell site to secure a connection to the network.

Features

Modern cellphones often have features beyond making phone calls and sending text messages, including Internet browsing, digital photography, video games, and GPS navigation.

Health effects

There is some concern about potential health effects related to cellphone use, particularly with regard to electromagnetic radiation.

See also

• Smartphone
• Mobile device
• Mobile app
• Mobile operating system

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