How Do I Change My GSM At&T Phone To A CDMA Cricket Phone?

GSM is the Global System for Mobile communications, which is used by Cingular and T-Mobile in the US, as well as almost every other cellular carrier elsewhere in the world. CDMA is Code Division Multiple Access, which can actually describe several different radio technologies, but usually when someone says CDMA they’re referring to Qualcomm’s CDMA2000 system, which is used by Sprint, Verizon, and Alltel in the US, as well as a few other companies in Asia and South America. There are some interesting technical differences which I’ll describe below, but as a customer, you mainly only need to worry about GSM vs. CDMA if you’re buying a phone from eBay or something. Make sure if your carrier uses GSM, you get a GSM phone, and vice versa.

Many phone models have both a GSM and a CDMA version, but some are GSM only or CDMA only. GSM separates calls into frequencies and time slots. (This is called Time Division Multiple Access, although there’s another incompatible system just called "TDMA" ... more.

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