Switched to Tmobile and now iPhone 4 won’t work

Discussion in 'iPhone Tips, Help and Troubleshooting' started by babybuuutch, Mar 22, 2013.

  1. babybuuutch macrumors member

    Joined:
    Jan 16, 2012
    #1
    I had a jailbroken iPhone 4 and used go phone on at&t today I switched to tmobile and now my sim won’t catch. I know I need to go into network and change the carrier but the network and apn doesn’t show up on my phone since it still thinks it’s on at&t. Anyone can help me out with this?
     
  2. Applejuiced macrumors Westmere

    Applejuiced

    Joined:
    Apr 16, 2008
    Location:
    At the iPhone hacks section.
    #2
    Is the iphone 4 unlocked?
    If not then your tmobile sim wont work.
    Only AT&T sims if its locked to them.
     
  3. babybuuutch thread starter macrumors member

    Joined:
    Jan 16, 2012
    #3
    Yes it’s unlocked. The problem is that my phone still thinks it’s on the at&t carrier instead of tmobile, therefore giving me an invalid sim in the upper left corner.
     
  4. Applejuiced macrumors Westmere

    Applejuiced

    Joined:
    Apr 16, 2008
    Location:
    At the iPhone hacks section.
    #4
    That doesn't make any sense.
    The phone doesn't just "think" its on AT&T.
    Once you remove it and stick in a different sim nothing from the old carriers network stays there.
    If its telling you invalid sim it is not unlocked.
    Try restoring it and try to activate it with your tmobile sim.
    If it doesn't activate and still tells you invalid sim then its not unlocked.
     

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