Unlock iPhone 3G 4.0 with Ultrasn0w 0.92

Unlock iPhone 3G 4.0 with Ultrasn0w 0.92

1. Jailbreak iPhone 4.0 using Redsn0w 0.9.5, we have posted guide here.
2. Now follow our guide to downgrade iPhone 4.0 baseband using Fuzzyband Downgrader
3. Once you have jailbreaked & downgraded iPhone 3G 4 OS go to Cydia, Manage tab at the bottom.
Note: T-Mobile users should disable 3G before installing ultrasn0w.
4.  Click on “Edit” and then on “Add”. You will be prompted to enter a url source. Type “http://repo666.ultrasn0w.com” and click on “Add Source”.
5. After successfully adding repository search for ultrasn0w in cydia and install the application
6. Restart your iPhone.