I have att service, came over from MetroPCS (was able to unlocked the phone and it is compatible GSM with att) so they were able to swap out my Metro SIM with theirs. Now two years later am looking to replace phone. I want to buy outright not pay monthly for life... if i choose one of the att phones on their site to purchase unlocked version on amazon will i be able to swap my sim to the new phone without any issues? Trying to avoid bloatware and paying higher cost for the phone itself. I've heard both - that i can np and that not all functions will work? last thing i want to do is spend $$ on a unlocked phone that isn't going to work fully, what's the point of that?? if trying to get really cheap phone maybe wouldn't be issue but planned to spend $200-300. Please advise. thank you!!