hello all, I am unfamiliar with how international versions of a phone works. I currently use AT&T Go Phone which will allow any unlocked phone on their service for the flat $45 a month plan. I am curious what the major differences are between the G930F and the G930A, aside from the obvious spec differences found through google. Am i open to getting less bands or towers, worse speed, etc? Or is this all a marketing scam so that people buy the more expensive american version?