Unlock iOS 4.3.3 on iPhone 4, 3GS Using Ultrasn0w 1.2.3
Ultrasn0w 1.2.3 has been released to make the unlock compatible with iOS 4.3.3 on iPhone 4 and 3GS, running on the old baseband. This release of Ultrasn0w is not a new unlock for iPhones with newer basebands, instead, it only fixes the compatibility issues on the existing devices, which are jailbroken (with preserved basebands: 01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00) on iOS 4.3.3. Updating iPhone 3GS baseband to iPad’s 06.15.00 might result in loss of GPS functionality. Proceed to the step by step guide to unlock iOS 4.3.3 on iPhone 4, 3GS Using Ultrasn0w 1.2.3.
Step 1: You will have to jailbreak your iPhone 4 or 3GS on iOS 4.3.3 and preserve the old baseband using either PwnageTool on Mac, or Sn0wbreeze on Windows.
Step 2: After jailbreak, you can unlock your iPhone on the supported basebands using Ultrasn0w 1.2.3 from Cydia.
To do this:
Start “Cydia” on your iPhone.
Touch on “Manage” tab on the bottom.
Touch on “Sources”.
Touch on “Edit” and then on “Add”.
You will be prompted to enter a url source.
Type “http://repo666.ultrasn0w.com” and touch on“Add Source” to add this repo if you haven’t already.
Cydia will now automatically update your sources by following a series of automated steps.
After installation is completed. Search for “ultrasn0w 1.2.3” in Cydia and install this application. This app will automatically unlock your iPhone so that you can use it with any carrier.
Step 3: Restart your iPhone and that’s it! you should now have a fully unlocked iPhone 4 or 3GS, running iOS 4.3.3.