A guide to the ANSI-136, explaining: how the ANSI-136 compliant mobile phone operates and how it works with the cellular network to allow customers to send and receive calls, and obtain services such as the Short Message Service; the ANSI-136 standardisation process; and how to bridge the gap between the ANSI-136 standard and actual implementation of ANSI-136 by describing network parameter settings, network optimisation techniques and equipment testing.