iPhone 3g: No SIM, need to upgrade before jailbreak/unlock?

Discussion in 'Jailbreaks and iOS Hacks' started by cpaparelli, May 23, 2012.

  1. cpaparelli macrumors newbie

    May 23, 2012
    I've been searching for a few days now, but I can't seem to find the exact answer I'm looking for.

    I have a used AT&T iPhone 3g that I intend to use with my T-Mobile plan.

    - The phone is currently at 3.1.2, but I'd like to update to 4.2.1

    - I don't have access to an AT&T SIM currently. I used my sister's yesterday to attempt to update the firmware, but I got the 3194 error. I haven't been able to try another computer because I don't have a SIM.

    - I don't know the baseband, because I can't get past the No SIM/Emergency call screen.

    How should I go about this? SIM-less jailbreak, update, then re-jailbreak, then unlock? Or is there a better alternative? I know I can download the 4.2.1 update from redmondpie, etc, but I'm not sure exactly how to install it without a SIM.

    Thanks in advance!

  2. PsstGreek macrumors 68040


    Oct 21, 2010
    Tampa Bay
    I would stay on 3.1.2, 4.2.1 will make the 3G sluggish and hard to use. Since your sister has AT&T, she can get the iPhone unlocked for you.

    Or you can jailbreak with Redsn0w (also activates the iPhone) and unlock with ultrasn0w.

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