I am with ATT now (contract free). I like to order iPhone 6 contract free for ATT, but the only contract free phone now is Tmobile? I understand that I can use Tmobile for ATT and vice versa ?, but Are they the exactly the same phone ?
You can by any device at full price at the apple store (except Sprint) and they all should be unlocked. I just purchased a Verizon 6 Plus full price and am using it on AT&T.