A GSM phone is a type of mobile phone that uses the Global System for Mobile Communications to send and receive phone calls. This is one of the two main standards for mobile communication in the world, with the other being Code Division Multiple Access (CDMA). Generally speaking, a GSM phone is likely to be a good choice for someone who travels outside the US a lot, changes carriers often, lives in a rural area, or needs to transfer a lot of data-heavy information.
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