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MULTI-USER RADIO COMMUNICATION
Global system for mobile communication (GSM) is a globally accepted standard for digital cellular communication. GSM is the name of a standardization group established in 1982 to create a common European mobile telephone standard that would formulate specifications for a pan-European mobile cellular radio system operating at 900 MHz. It is estimated that many countries outside of Europe will join the GSM partnership.
Subscriber Identity Module (SIM). It is a memory device that stores information such as the subscribers identification number, the networks and countries where the subscriber is entitled to service, privacy tax and other user specific information A subscriber uses the SIM with a four digit personal ID number to activate service from GSM phone.
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