If your baseband is different from these, then you can’t unlock for the time being. If your baseband matches one of those above but you are on an older firmware, use PwnageTool or Sn0wbreeze to update while preserving the baseband.
In this tutorial, we will show you how to unlock your iPhone 4.3.3 using UltraSn0w…
- Make sure your baseband matches any of the basebands listed above. If it doesn’t, you can’t unlock. If it does, you may update your iPhone to 4.3.3 while preserving the baseband using PwnageTool. Note that you don’t have to update to 4.3.3. If for example you are still on iOS 4.1, you may stay there and still use UltraSn0w.
- Make sure your iPhone is jailbroken. The easiest way is to use RedSn0w, although it can be tricky as you might accidentally update your baseband. Which is why I suggest you use PwnageTool or Sn0wbreeze instead. PwnageTool or Sn0wbreeze will not update your baseband.
- After jailbreaking, go to Cydia and search for “UltraSn0w”. Download and install the app, then reboot your iPhone.

Steps to Install Ultrasn0w 1.2.3 on iPhone 4/3GS Offline:
To Download Ultrasn0w 1.2.3 Deb File Click HereLaunch iPhone Explorer or iPhone Pc Suite, connect your iPhone to your PC or Mac via USB cable and place Ultrasn0w 1.2.3 DEB file in the following location:
Location: /var/root/Media/Cydia/AutoInstall
Thats it. Reboot your iPhone. After reboot you will find it fully jailbroken and unlocked on iOS 4.3.3. Cheers!
If you use T-Mobile, make sure to turn 3G OFF in your iPhone settings
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