3G Unlock Not Working on 2.2.1/2.28.00

Discussion in 'Jailbreaks and iOS Hacks' started by Mannyak, Jun 18, 2009.

  1. Mannyak macrumors newbie

    Mar 8, 2009
    Normally I use my iPhone 3G on AT&T and it's fine, but I still didn't upgrade the baseband just in case I wanted to unlock. Now I traveled out of the country for vacation and want to use a different sim card, so I installed yellowsn0w through Cydia. But when I try to use the new sim card it tells me "SIM Failure".

    Anyone know why?
  2. Mannyak thread starter macrumors newbie

    Mar 8, 2009
    I know it's probably something stupid, but I really need help on this, I'm here for a month and phones here are pretty expensive.

    So bump.

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