T-Mobile is a GSM network carrier and works with GSM cell phones. GSM – which stands for Global System for Mobile Communications – is one of two types of wireless frequencies used for cell phone service. CDMA and GSM provide 3G service to fill in the gaps when your 4G signal drops.
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Which Are GSM ? In the US, Verizon, US Cellular, and the old Sprint network (now owned by T-Mobile) used CDMA. AT&T and T-Mobile used GSM. Most of the rest of the world used GSM.
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