Upgrade to iPhone 8📱:Pay only $8 a month
  1. Amilly33's Avatar
    Ok so I know nothing about this stuff. This is what I need. I want the phone on t mobiles network. Here's the facts. I have a iPhone 3GS that I updated to the ios4.2 so please tell me if it's possible to do what I want to do and the correct way to go about it. Thanks
    09-26-2010 01:49 PM
  2. myzhi's Avatar
    Do you mean 4.0.2? Anyway, to unlock, you need to first jailbreak the phone, and then, install ultrasnow to unlock. Unfortunately, there are not current jailbreak for firmware 4.0.2 and plans to either. You will have to wait for possible 4.1 JB.
    09-26-2010 01:57 PM
  3. Amilly33's Avatar
    Can I downgrade then jb and unlock?
    09-26-2010 02:05 PM
  4. myzhi's Avatar
    Apple put in SHSH security check so you can't install firmware they don't allow. Currently, they are only sending 4.1 SHSH files and only allowing you to install 4.1. If you had previously saved the SHSH files while Apple was still sending them out, you could trick ITunes into allowing you to downgrade. And, SHSH files are unique for each iPhone & firmware version. Thus, the question do you have SHSH files saved? I am guessing no since you don't seem to be aware of them.
    Last edited by myzhi; 09-26-2010 at 02:31 PM.
    09-26-2010 02:21 PM
  5. Amilly33's Avatar
    No I don't. This sucks cuz I already have sim card/ service for tmobile to put in the iPhone.
    09-26-2010 02:25 PM
  6. myzhi's Avatar
    Still suggest you still saved 4.1 SHSH files for future use. You don't have to be JB to do it. Download and run Tinyumbrella.
    09-26-2010 02:33 PM
  7. Amilly33's Avatar
    Ok thanks for your help
    09-26-2010 02:37 PM