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GSM (Global System for Mobile Communications,
originally Groupe Spécial Mobile), is a standard
set developed by the European
Telecommunications Standards Institute (ETSI)
to describe technologies for second generation
(2G) digital cellular networks. Developed as a
replacement for first generation(1G) 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(Enhanced Data rates
for GSM Evolution). The GSM standard is more
improved after the development of third
generation (3G) UMTS standard developed by
the 3GPP. GSM networks will evolve further as
they begin to incorporate fourth generation (4G)
LTE Advanced standards. "GSM" is a trademark
owned by the GSM Association.

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Posted by 3GRaj