Generally, a mobile phone is a portable device that connects to a cellular network. These networks typically use public switched telephone network (PSTN) to send and receive calls. A cell phone transmits voice, video, and other data.

Mobile phone technology has come a long way from the simple phone that was introduced in the 1980s. Today, it includes features such as MP3 players, GPS devices, and video cameras. These phones are now available for purchase directly from manufacturers, or through a cell phone service contract.

The first commercial automated cellular network was launched in Japan in 1979. It used a network of fixed antennas called base stations to transmit and receive radio waves. These phones were large and heavy.


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