The most widely deployed cellular communications standard GSM, is relatively slow data transfer, with 2g technology.
With its availability in more than 210 countries worldwide, GSM, or Global System for Mobile Communication, was once regarded as the industry standard for communication, notably in Asia and Europe.
The switching system (SS), base station system (BSS), and operation and support system are the three main systems that make up the GSM network (OSS).
A mobile network operator that makes use of the cellular Global System for Mobile communications is known as a GSM carrier. GSM carriers like AT&T and T-Mobile offer service for GSM phones, whereas CDMA carriers can only work with CDMA-compatible phones.
3G, 4G, and 5G have developed from the GSM (2G).
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