p 193 countries and territories. It was developed

p { margin-bottom: 0.25cm; line-height: 120%; }a:link { }

GSM
is a standard developed by the European Telecommunications Standards
Institute (ETSI) to describe the protocols for second generation
digital cellular networks used by mobile devices such as tablets,
mobile.It was first deployed in Finland in 1991.As it was better
adapted it takes 90% of total market in 193 countries and
territories.

It
was developed to replace the 1G i.e Analog cellular networks.It is
originally described as digital networks with
circuit switching system optimized for full duplex voice
telephony.It was then followed by 3G (UMTS) and then by 4G (LTE).

p { margin-bottom: 0.25cm; line-height: 120%; }a:link { }

GSM
is a standard developed by the European Telecommunications Standards
Institute (ETSI) to describe the protocols for second generation
digital cellular networks used by mobile devices such as tablets,
mobile.It was first deployed in Finland in 1991.As it was better
adapted it takes 90% of total market in 193 countries and
territories.

It
was developed to replace the 1G i.e Analog cellular networks.It is
originally described as digital networks with
circuit switching system optimized for full duplex voice
telephony.It was then followed by 3G (UMTS) and then by 4G (LTE).

p { margin-bottom: 0.25cm; line-height: 120%; }a:link { }

GSM
is a standard developed by the European Telecommunications Standards
Institute (ETSI) to describe the protocols for second generation
digital cellular networks used by mobile devices such as tablets,
mobile.It was first deployed in Finland in 1991.As it was better
adapted it takes 90% of total market in 193 countries and
territories.

It
was developed to replace the 1G i.e Analog cellular networks.It is
originally described as digital networks with
circuit switching system optimized for full duplex voice
telephony.It was then followed by 3G (UMTS) and then by 4G (LTE).