GSM is a popular worldwide standard for communication between wireless mobile devices. When GSM was originally created in 1982 it stood for Groupe Spécial Mobile, but that has since changed to Global System for Mobile Communications. The first GSM network was established in Finland in 1991. Today around 80% of the mobile market uses the GSM standard, and it is used by more than 1 billion people in over 200 countries.
This guide provides reviews of GSM compatible phones and mobile plans, and provides a number of tips for using GSM services like phone tracking.