So will the Apple Store sell you a Verizon phone and activate it on Tmobile, so I can make the switch to Verizon if I want to later?Yes, you can use a VZW iPhone 6/6+ on Tmobile. I went with VZW, stuck with them rather, because I understood that it gave me more carrier options. I called both Apple and VZW and they confirmed that you can go from VZW to Tmobile and back but if you get an AT&T phone, you cannot get to VZW on it. If that makes sense. That last part could be wrong...hell, I could be wrong all together.