There are both GSM and CDMA phones from these companies. Apple is one of the most popular mobile phone brands from USA. Samsung is one of the most popular brands from South Korea. Xiaomi, Huawei, Oppo ...
In the U.S., AT&T and T-Mobile are GSM carriers. Contrast with CDMA phone. See GSM. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.
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