I got my iPhone 6+ and there was something wrong with the screen, so I went to the Apple Store and got a replacement for it. I heard someone on here say before that all replacement units are just CDMA unlocked models. (mine was an AT&T model) Not sure if that's true. How can I check? Model is A1522, which comes up as a Verizon model, but the box for my original one says that was an A1522 as well and was directly from AT&T.