Hi this is priest.
I am telling you some of the importent intro of the GSM.
GSM (Global System for Mobile Communications), is a standard set developed by the European Telecommunications Standards Institute to describe technologies for second generation digital cellular networks. Developed as a replacement for first generation analog cellular networks, the GSM standard originally described a digital, circuit switched network optimized for full duplex voice telephony.
The standard was expanded over time to include first circuit switched data transport, then packet data transport via GPRS (General Packet Radio services). Packet data transmission speeds were later increased via EDGE. The GSM standard is more improved after the development of third generation UMTS standard developed by the 3GPP. GSM networks will evolve further as they begin to incorporate fourth generation LTE Advanced standards. "GSM" is a trademark owned by the GSM Association.


Thankyou