![]() Starting with the iPhone 5, they're the same and can be switched at will, provided it's not locked to a contract. Starting with the 4S the phones were the same with both CDMA and GSM, but Verizon locked the GSM in theirs for only overseas use outside the USA (it's possible to get this unlocked). The last iPhone which had different CDMA and GSM versions was the iPhone 4. ![]() CDMA with Verizon is considered a "legacy" system to support those old phones and it will likely still be in place for a while. ![]() There are still some 3G and older phones being used. The days of CDMA (Verizon and Sprint) vs GSM (AT&T and most others) are almost gone. You can buy a SIM-free and it will work on Verizon or AT&T, and possibly on Sprint (depends on phone and model). This is an old question, but I've seen similar questions about the iPhone 6, 6s and SE now, which are all offered "SIM-free".
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