- Short form of Global System for Mobile Communications, is a wireless network system
- A standard for digital cellular mobile communications
- International roaming arrangements are enabled among mobile network operators, by providing the subscribers to use their personal mobile phones anywhere in the world.
- GSM is considered as second generation mobile, as signaling and speech channels are digital
- The carriers can be replaced without replacing mobile phones.
- The ubiquity of GSM implementations is also enabling the switching between network operators, who can choose equipment from many GSM equipment vendors.
- GSM pioneered low cost SMS implementation
- The GSM standard includes a worldwide emergency telephone number feature.
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