GSM (Global System for Mobile communication) provides a service to more than 500 million users throughout 168 countries worldwide. It is the world market leader serving 69 0f all mobile digital users and is currently evolving into UMTS (Universal Mobile Telecommunication System)..
GSM, cdmaOne and 3G Systems provides the reader with a comprehensive and unique description of the two leading second generation cellular radio systems: the global system for mobile communication (GSM) and cmdaOne
