Global system for mobile telecommunication (GSM)
comprises the CEPT-defined standardization of the
services, functional/subsystem interfaces, and
protocol architecture, based on the use of worldwide
standards produced by CCITT and CCIR, for a pan-
European digital land mobile system primarily intended
to serve users in motor vehicles. The digital mobile
radio networks, for which GSM represents the European
standards, provide powerful message signaling
capabilities that facilitate and enhance
roaming, compared to the first generation analogue
systems, through automatic network location detection
and registration.