Question: can a verizon iphone be used on at&t?
Answer: There are two versions of each phone: ... The AT&T and T-Mobile variants, however, only come with a GSM chip. That means you can't use an AT&T or T-Mobile iPhone on Verizon or Sprint, since those versions don't have CDMA chips. (You can, however, take an AT&T iPhone to T-Mobile, or vice versa).