I apologize if this is a dumb question and has already been answered somewhere in this long thread. I went to the apple store and purchased an A1549 Iphone 6 yesterday. From my understanding in some of the replies, they were able to just install a SIM from ATT, T-Mobile or Sprint and the phone would work. I placed a nano Sprint SIM in this phone and I couldn't place a call, also "SIM failure" was displayed on the phone screen. I told them specifically that I needed to purchase the "unlocked" version and no contract. Which is what I was given (So I believe) Am I missing something here? Thanks in advance for any help that can be offered.
If I'm not mistaken, Sprint does not work on any unlocked models (AT&T/T-Mo/Verizon; A1549). You will need the Sprint model A1586 for the Sprint to work. Of course Sprint iphone is locked to their carrier and won't be unlocked for domestic use.