GSM- R Which Carriers are CDMA? In the U.S., Sprint, Verizon and U.S. AT&T and T-Mobile use GSM. Most of the rest of the world uses GSM. The global spread of GSM came about because in 1987, Europe. Check out Groupon's list of GSM cellular carriers. This list of GSM providers may not be complete. Please check with your provider before purchasing a phone.
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April 2017
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