What is it?
Global Systems for Mobile communications (GMS) is a second generation (2G) standard used for transmitting data services and voice calls from one user to another user) for mobile networks and uses a variation of TDMA, also known as Time Division Multiple Access. In other words, it’s a system that helps wireless communication through mobile voice. The use of harmonised spectrum across most of the globe, linked with GSM’s international roaming capability, allows travellers to access the same mobile services at home and abroad. GSM allows individuals to be reached through the the same mobile number in up to 219 countries.
How does it work?
GSM digitizes and compresses data, then sends it down a channel with two other streams of user data, each in its own time slot. It operates at either the 900 MHz or 1800 MHz frequency band.