These are instructions on how to unlock the iPhone 4,
iPhone 3GS, and iPhone 3G for use with any GSM
cellphone carrier using UltraSn0w. This will work with
the iOS 4.2.1 firmware if you are on
Before you can follow these instructions you must have
a jailbroken iPhone and you must be on the 04.26.08,
05.11.07, 05.12.01, 05.13.04, 06.15.00, or 01.59
Press to launch Cydia Installer from your SpringBoard.
Press to select the Manage tab at the bottom of the screen.
Press to select the large Sources button
If the ultrasn0w repo is not present press the Edit button at
the top right of the screen. Otherwise, skip to Step
Press the Add button at the top left of the screen.
Enter http://repo666.ultrasn0w.com/ as the source URL and
press the Add Source button.
Once the source has been added press the large Return to
Press the Done button at the top right of the screen.
Press to select repo666.ultrasn0w.com from the list of user
Press to select ultrasn0w from the list of packages
Press the Install button at the top right of the screen
Press the Confirm button at the top right of the screen.
After installation completes successfully press the
large Restart Springboard button.
You should now be able to insert the SIM of your choice!