Do all ATT SIM cards work on any Iphone 4?

Discussion in 'iPhone Tips, Help and Troubleshooting' started by tangytangojuice, Nov 21, 2011.

  1. tangytangojuice macrumors newbie

    Joined:
    Nov 21, 2011
    #1
    So, i bought an iPhone 4 from a guy on ebay, but it is still a locked iphone. I accidentally upgraded it to 4.3.5 so my baseband turned to 04.11.01, which is not unlockable by ultrasn0w. But, my friend was able to jailbreak it in a way, where it is kind of jailbroken, but i do not have cydia, but I am able to just put in my ATT GoPhone Sim card, and it works. Do all Att SIM cards just work if you put it in an iphone 4? Could I upgrade my phone onto ios 5, from itunes and just put in my sim card and works?

    Thanks.
     
  2. gh0001 macrumors member

    Joined:
    Sep 10, 2008
    #2
    you don't need to unlock the phone if you just want to use it on AT&T (assuming it is an AT&T iphone to begin with). you only need to unlock it if you want to use it on, say, T-mobile, or a foreign operator.

    for the same reason, you should be able to just upgrade to iphone 5 and use it on AT&T.
     
  3. tangytangojuice thread starter macrumors newbie

    Joined:
    Nov 21, 2011
    #3
    Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_5 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8L1 Safari/6533.18.5)

    But I have a goPhone sim card, not a sim card for the regular post paid att plans. Will it still activate?
     
  4. hexonxonx macrumors 601

    Joined:
    Jul 4, 2007
    Location:
    Denver Colorado
    #4
    Yes. An AT&T sim is an AT&T sim regardless if it is pre-paid or not.
     
  5. tangytangojuice thread starter macrumors newbie

    Joined:
    Nov 21, 2011
    #5
    Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_5 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8L1 Safari/6533.18.5)

    So during the iOS 5 activation I just leave my sim card in and activate it.
     

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