Using iPhone OTB 1.1.2 with old ATT/Cingular Sim

Discussion in 'Jailbreaks and iOS Hacks' started by davebc, Dec 18, 2007.

  1. davebc macrumors newbie

    Dec 17, 2007

    I'm on a business plan so therefore I can't use an iPhone on my current plan. I've heard somewhere that if I activate and jailbreak the new OTB 1.1.2 iPhone, then I can stick my old Cingular sim into the phone and use it without having to change my plan. Is this true? Or do I have to unlock it to use it with my old Cingular sim??? Thanks!
  2. Consultant macrumors G5


    Jun 27, 2007
    Yup. Out of box iPhone 1.1.2 can be software jailbreaked / activated to use existing AT&T SIM cards. You don't have to SIM unlock (currently impossible).
  3. davebc thread starter macrumors newbie

    Dec 17, 2007
    So nothing else needs to be installed on it, I just activate and jailbreak it and I will be able to stick my old sim in there?

    Sorry for the excessive questioning, I just don't want to spend $400 on it if I can't use it.
  4. davebc thread starter macrumors newbie

    Dec 17, 2007
    If anyone could help me with this it would be greatly appreciated.

    Do I have to activate/jailbreak it a certain way to make it work with my old sim? Or if I just activate and jailbreak it will I be able to stick my Cingular sim from my other phone in it?
  5. Kenal0 macrumors regular

    Sep 15, 2007
    That is correct, Jailbreak and activate. You need to make sure you have a data plan. I am using the sim from my ATT Blackberry so the BB data plan covers it.
    Any unlimited data plan will work so if you currently have for example a Razr, you can add an unlimited plan and you should be fine. You will also have to add a text plan if you do not have one as well.
  6. jside macrumors newbie

    Jan 10, 2008

    if i also have an att sim i have to downgrade to 1.1.1 then upgrade back to 1.1.2 with oktoprep in order to use my sim card?
  7. rlowe44 macrumors newbie

    Dec 31, 2007
    Just a warning; I have an OLD AT&T SIM card in an old Siemens phone, and it will not work in any iPhone. It also can't support a data plan. Call your local AT&T office and they can tell you if it will or not.

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