GSM (Global System for Mobile) communications is the most popular cell phone standard. According to the GSM Association, which represents the interests of the worldwide mobile communications industry.

GSM offers wider international roaming capabilities than other U.S. network technologies and can enable a cell phone to be a “world phone.” With GSM, switching SIM cards activates different phones to the same network account. In addition, GSM allows for simultaneous data and voice operation.

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