Ask Tii - Unlocking iPhone 3GS running iOS 4.2.1

Hi Rob,

I've browsed your FAQ's and visited some unlock sites, but still a bit confused. I have a 3gs with version 4.2.1 firmware and baseband 5.15.04. I want to unlock the phone for use on other carriers. The latest solution I found was to jailbreak and use the iPad2 baseband which will prevent any later undo of the jailbreak/unlock. Are there any other firmware versions I should convert to before proceeding with jailbreak/unlock? Is the 4.2.1 firmware a deadend regarding any new development work for jailbreak/unlock solutions?

Regards,

Doug S.

 

 

Hi Doug,

My understanding is that you actually want to be at baseband 6.15.00 and use ultrasn0w 1.2 for unlocking. Here are links for a jailbreak tutorials that will get you to the proper baseband - Pwnage Tutorial   and  Redsn0w Tutorial.   

Once you are re-jailbroke and updated to the proper baseband you need to do the following:

 

1. In Cydia add the following Source - http://repo666.ultrasn0w.com

 

To do this Tap on "Manage" tap at the bottom of Cydia and then tap on "Sources".  Then Tap on "Edit" and then "Add".  In the Pop up box type or paste in - http://repo666.ultrasn0w.com - and the Tap "Add Source"

 

2. Search for - ultrasn0w 1.2 - and install it.  Once it is installed your iPhone will be unlocked - no need to launch the app.   

 

3. Re-boot (turn off and back on) your iPhone.  It should then restart in an unlocked state and you should be able to use your iPhone on any GSM carrier. 

 

Let me know if you have any questions per the above or any issues.

 

Regards,

Rob W