GSM

GSM mean Global Systems for Mobile communications. It is called a cellular network, mobiles can connect to it using cells in the immidiate vicinity. It was created in 1982 so that many people using this standard accross Europe could connect to the internet.

The basic principle for the creation of GSM was to allow the mobile broadband industry to grow so that many people can connect to broadband on more devices over a wider area. GSM digitizes and compresses data, then sends it down a channel with two other streams of user data. It operates at either the 900 MHz or 1800 MHz frequency band. (A wider range of freguencies also means that this is more widely availible.) 

GSM today is a huge corperation with over 690 mobile networks using it and it represents 82.4 percent of all global mobile connections. It is active in over 200 countries!