GSM

GSM (850/900/1800/1900) GSM/GPRS/EDGEGSM technologyGlobal System for Mobile CommunicationsGlobal System for Mobile Communications (GSM)GSM-1800GSM900mobile phone base station GSM/3G Mobile Service.gsm
GSM (Global System for Mobile communications) is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation (2G) digital cellular networks used by mobile devices such as tablets.wikipedia
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