1. rockdaddy99's Avatar
    I unfortunately updated my 2g phone to the 3g OS but I have a tmobile sim card in the phone.
    It was working fine before, but now I'm getting a 'non supported sim card' error message when I connect it to my computer and launch Itunes and the phone only works in 'emergency' mode.

    Is there a fix for 3g OS on a 2g phone with tmobile?
    If not, how do I downgrade or uninstall and go back to the old OS?

    07-06-2009 01:52 PM
  2. joetdc's Avatar
    I always use the AT&T sim then put the tmobile sim in after the unlock.
    Restore and try it tha way.
    07-07-2009 12:09 PM
  3. Savio's Avatar
    You mean 3.0 firmware/OS right? Not 3G OS? Kind of two different things...
    Anyways, just use a program like QuickPwn or redsn0w to activate your phone (so that you can get past the slide to emergency screen) and unlock it as well.
    07-07-2009 01:38 PM