As with a previous post that I viewed, I have an LG G4 that I bought off of Amazon as an unlocked phone but it is obviously an AT&T phone because their logo shows up upon start up. I've tried to remove or disable all AT&T apps and registered the phone with the t-mobile APN. I can make phone calls, receive texts, surf the web and all that, just can't recieve phone calls! I'm at my wits end and about to just return the phone! Please help!!!