GSM systems use encryption to make phone calls more secure.

Mobile phone based intercoms often known as GSM systems allow the operation of gates from anywhere in the world.

Systems that efficiently use the available spectrum have been developed e.g. the GSM system.

Digital cellular telephone services, such as the GSM system, do not generate dial tones.

Commercial service using the GSM system did not actually start until 1991.

GSM systems provide a number of useful features:

And much new wireless technology is based on the GSM system.

The digital GSM system came into use in 1993.

The fact is that the internal market has worked to the advantage of developing the GSM system, which has become a world standard.

Observe this table only deals with GSM systems.