From Longman Business DictionaryGSMGSM noun [uncountable]1TELECOMMUNICATIONSGlobal System for Mobiles; a system that makes it possible for people to use MOBILE PHONES (=telephones you can carry with you and use in any place)France Telecom wanted the Swiss PTT to pay a fee for the use of the French GSM network.2abbreviation for GENERAL SALES MANAGER
