SSaging> (SMS) A meSSage Service offered by the GSM digital cellular telephoneSyStem. USing SMS, a Short alphanumeric meSSage (160 alphanumeric characterS) can be Sent to a mobile phone to be diSplayed there, much like in an alphanumeric pagerSyStem. The meSSage iS buffered by the GSM network until the phone becomeS active. (1996-02-18)