Phone System !!!!!

Advanced Mobile Phone System !

Advanced Mobile Phone System (AMPS) is the analog mobile phone system standard developed by Bell Labs, and officially introduced in the Americas in 1983. It was the primary analog mobile phone system in North America (and other locales) through the 1980s and into the 2000s, and is still widely available today, although use has dropped considerably with the introduction of various digital standards.

Introduction of GSM and CDMA

AMPS and D-AMPS ("TDMA") are now being phased out in favor of either CDMA2000 or GSM which allow for higher capacity data transfers for services such as WAP, Multimedia Messaging System (MMS), and wireless Internet access. There are some phones capable of supporting AMPS, D-AMPS and GSM all in one phone (using the GAIT standard).