A SIM free iphone 6/6+ works perfectly fine with Verizon. I bought the SIM free iphone 6 from apple store few weeks ago and let verizon activate with my current account (unlimited data plan). Nothing changed. I switch back and forth between iphone 5s and iphone 6 (now I used iphone 6). So all SIM card (nano) is compatible, you shouldn't have any problem. Good luck-:)