iPhone switching carrier by itself

Discussion in 'iPhone Tips, Help and Troubleshooting' started by GGarcia411, Feb 15, 2013.

  1. GGarcia411 macrumors newbie

    Feb 15, 2013
    Okay I'm gonna explain this with as much detail as possible. I have an unlocked iPhone 4S that I am using with T-Mobile. Sometimes at random (mostly places where my signal is weak, like the outskirts of town) the carrier switches from T-Mobile to AT&T and it says 4G. It was an AT&T iPhone before I had it unlocked. I'm pretty sure it's impossible to get 4G on a 4S. When I tried to load a page or anything using data, it would not load and it would give me an error. But I was able to make/receive calls. After a while it went back to normal and the data worked again. I'm just wondering what is going on. Any help would be appreciated! Sorry about the carrier changes, I was using Zeppelin.

    I was going to upload screenshots but they wont all fit. This is a link to the screenshots that I uploaded to mediafire
  2. Applejuiced macrumors Westmere


    Apr 16, 2008
    At the iPhone hacks section.
    AT&T and Tmobile have an agreement to let eachother roam on their network and viceversa.
    So if there is no connection to Tmobile your phone will switch and connect to AT&T so you can still get service.
    Not sure why data doesnt work but it should.
    And yes you can get 4G on AT&T with a 4S. Its what they call their HSPA+ network and mostly a marketing gimmick.
    Its not real LTE, just a faster 3G that they call 4G.
  3. GGarcia411 thread starter macrumors newbie

    Feb 15, 2013
    You just blew my mind ._. I didn't know any of that, thanks for the reply! :D

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