I took a mini trip for the 4th of July to an area in my state that normally has decent coverage on T-Mobile's network. I ran into a lot of problems with this phone when I got into this area because the phone is provisioned for HSPA+ and this area is Edge/3G, more Edge than 3G. When I tried to use my phone I continuously got dropped calls or my calls would not complete and I am not going to get started on the net service out there. Because of the phone constantly looking for a 4G connection it sucked my battery down rather quickly and my phone just wasn't working. I am glad that this was just a getaway and not where I live, however, it is imperative that if you are considering this phone that you go to [...]and check the coverage very carefully because if you are not in a 4G area there is a great chance that you will assume that the phone bites when in actuality it's the coverage, not the phone. I am not too sure about the AT&T customers and how they may fare with this issue because I do not have an AT&T sim, but I would send my advice their way also. Check the coverage at AT&T if you have that service because your sim will be hitting their cell sites.