The different cellular systems currently in operation throughout the world are :
Advanced Mobile Phone System (AMPS) : The original system developed by Bell Labs, known as the U.S. cellular standard.
Total Access Communication System (TACS) : Broadly based on the U.S. AMPS system, TACS was chosen as the standard operating network in the United Kingdom.
Nordic Mobile Telephone System (NMT) : The first transnational cellular system to be developed. The NMT cellular network operates across all Scandinavian countries.
Network D and Network C : NetzDor C900 and NetzCor C450 were both developed in West Germany.
Mobile Automatic Telephone System-Europe (MATS-E) : A proposed European System developed jointly by Philips (Holland) and ...