iPhone Dev team today has released a new version of UltraSn0w to unlock iPhone 4, iPhone 3GS running iOS 4.3.3. Those iPhone 4/3GS owners who were waiting for PwangeTool to upgrade their devices to iOS 4.3.3 can now download PwangeTool 4.3.3 here and preserve the unlockable baseband and then use UltraSn0w 1.2.3 to unlock iPhone 4/3GS on iOS 4.3.3. The new version of UltrasnOw 1.2.3 is now easily downloadable through Cydia and unlocks your iPhone 4 /3GS for following basebands:
How to Unlock iPhone 4 / 3GS on iOS 4.3.3 using UltraSn0w 1.2.3
Step 1: Start Cydia on your iPhone 3G /3GS and go to add sources.
Step 2: Now type the following repo in the URL field http://repo666.ultraSn0w.com.
Step 3: Now search for ultrasn0w 1.2.3 using Cydia search bar. Once located, install by tapping the button on the top left corner of the display.
Step 4: Let the installation complete and finally you will have an unlocked iPhone 3G / 3GS running jailbroken iOS 4.3.3.
Remember: Ultrasn0w unlockers must stay away from redsn0w rc15! Use only a custom IPSW to update to 4.3.3, to avoid updating your baseband. UltraSn0w 1.2.3 does not support 02.10.04 / 03.10.01 / 04.10.01 / 05.14.02 / 05.15.04 / 05.16.02 basebands.