AMPS systems includes:

AMPS ( Advanced Mobile Phone Service ) AMPS is used in North and South America. It is also in the Asia/Pacific region and can be found in countries such as Australia, New Zealand, South Korea, Singapore, Taiwan, Thailand and Israel. Hong Kong discontinued analog service July 1, 1997.

C-NET ( also OBL-C ) This unique 450 MHz-based system was first introduced in Germany in 1985 and adopted by South Africa and Portugal.

ETACS ( Extended Total Access Communication System ) The TACS system was developed as a UK derivative of the US AMPS technology. It was first implemented in the UK in 1985. Several years later, the technology was upgraded and renamed ETACS. The UK, Ireland, Malta, Italy, Spain, Austria and a number of countries in Asia, the Middle East, and Africa also have adopted ETACS technology.

J/NTACS ( Japan TACS/Narrowband ) JTACS is a derivative of the UK TACS system for Japan, which was designed by Motorola and introduced in 1989. A narrow band version called NTACS was introduced in late 1990.

NAMPS ( Narrow band Advanced Mobile Phone Service ) NAMPS was the next generation of AMPS systems. NAMPS is a cellular call-handling system that uses digital signaling techniques to split the existing 30 kHz wide band voice channels into three 10 kHz narrow band voice channels. The result is three times more voice channels capacity than traditional AMPS system provides. NAMPS cellular phones are manufactured for dual mode operation, and they are compatible with traditional AMPS systems.