Global System for Mobile Communications (GSM) is a second generation digital standard for mobile telephony using several frequency bands such as 900 and 1800 MHz.Nowadays the main mobile system in terms of number of users, the European standard has a strong presence in Europe, the Middle East, Africa, Asia and also on the American continent. Composed of fixed transmitters (relay antennas) and mobile receivers (telephones), it is accessible by 80% of the population and covers approximately 50% of French territory.
GSM network is ideal for “voice” type communications. It comes with a SIM card (Subscriber Identity Module), a tool that personalizes communications, and a PIN code (Personal Identification Number), which is essential for using the SIM card on the GSM network.
Mobile Network are relying on three main technologies :
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