GSM<p>Global System For Mobile Communications 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. It has become the global standard for mobile communications – with over 90% market share, operating in over 193 countries and territories.</p> <p>See also: <a href="https://en.wikipedia.org/wiki/GSM">GSM</a></p>