what is a gsm phone
GSM (Global System for Mobile Communications, originally Groupe Special SpÃ©cial), mobile 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, phones first deployed In finland In july. 1991SM is a cellular network, which means that cell phones connect to it by searching for cells in the immediate vicinity. There are five different cell sizes in a GSM networkâ macro, micro, pico, femto, and umbrella cells.