pan-European digital cellular mobile system; the central standard, developed by ETSI, for digital (2nd generation) mobile systems, using TDMA (time division multiple access) techniques. GSM has been supported by Directive 87/372/EEC establishing harmonised frequency bands for GSM and a Council Recommendation and Resolution on its co-ordinated introduction. The system supports Roaming, and a broad range of features., digital land mobile mass service for private and local business users which offers high quality voice and high system availability in urban areas, as well as small user terminals (hand-held size) at a low price (car phone standard)