Describe the functions of the MS and SIM. Why does GSM separate the MS and SIM? How and where is user-related data represented/stored in the GSM system? How is user data protected from unauthorized access, especially over the air interface? How could the position of an MS (not only the current BTS) be localized? Think of the MS reports regarding signal quality.

GSM and GPRS :What exactly these are? Difference between | IoTDunia

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¿Qué son CDMA y GSM? Te explicamos las principales diferencias