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Mobile Telephone Service. This system was introduced in 6-17-1946. Also known as Mobile Radio-Telephone Service.This was the founding father of the mobile phone. This system required operator assistence in order to complete a call. These units do not have direct dial capabilities.

Improved Mobile Telephone System. This system was introduced in 1969 to replace MTS. IMTS is best known for direct dial capabilities. A user was not required to connect to an operator to complete a call. IMTS units will have a keypad or dial similar to what you will find on a home phone.

Advanced Mobile Phone System. This system was introduced in 1983 by Bell Systems, the phone introduced by Motorola in 1973 and released for public use in 1983 with the Motorola 8000. AMPS also known as 1G and cellular, should not be confused with its European counterparts such as NMT,

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