![]() If you move from an AT&T-enabled device to Verizon, which lives on CDMA, however, that process won’t be simple. If you’re on a GSM network like AT&T or T-Mobile, you could technically take your AT&T SIM card, pop it into a T-Mobile-enabled device, and start using your phone on AT&T’s network after informing AT&T of the change. Remember how we said that there are two dominant networks in the U.S.-GSM and CDMA. Do SIM cards work on any carrier network? (and most carriers around the world), and CDMA is used by Verizon and Sprint. GSM networks are used by AT&T and T-Mobile in the U.S. SIM cards are installed in all phones across GSM and CDMA networks. Based on a SIM card, carriers can identify what country you’re in, what network you’re connecting to, and your SIM card ID, which identifies you on the network. Interestingly, SIM cards were developed in 1991, and although their sizes have changed, their functionality has stayed the same.
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