Verizon used CDMA, which stands for code division multiple access, while AT&T and T-Mobile used GSM, Global System for Mobiles.īut most phones manufactured after 2010 are “dual band” and have been able to operate on either network as mobile phone companies built up their 4G LTE networks. The answers vary by what kind of phone you have and which carrier you’re with.Ĭarriers used to have two standards. Here’s how to determine if your phone is unlocked and how to request that it be unlocked with your carrier. Or perhaps you've purchased a new phone and want to make sure your old one is unlocked to sell it. Other reasons to figure out whether your phone is unlocked: You’re ready to take that bucket list trip to Europe and want to rent a SIM card while you’re there since it likely will be much cheaper than roaming charges overseas with your existing carrier.
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