[HOW-TO] - Unlock iOS 4.3.3 (Baseband 01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00 ) using Ultrasn0w 1.2.3

[SOURCE: Ultras0w]
Along with Redsn0w 0.9.6RC15, the iPhone Dev Team has released a new version of Ultrasn0w 1.2.3 which unlocks iPhone 4, 3GS on iOS 4.3.3 for those who are already rely on unlock. Ultrasn0w 1.2.3 guide below. Ultrasn0w 1.2.3 supports 01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00 basebands.

STEP 1: First, you will have to jailbreak your iPhone 4 or 3GS on iOS 4.3.3. Instructions on how to jailbreak iOS 4.3.3 using Redsn0w 0.9.6RC15 can be found here.

STEP 2: Once you are done with the jailbreak, you can now unlock your iPhone on the supported basebands using Ultrasn0w 1.2.3 from Cydia. To do this:

1. Start �Cydia� on your iPhone.
2. Touch on �Manage� tab on the bottom.
3. Now touch on �Sources� as seen in the screenshot below:
5. 

Touch on �Edit� and then on �Add�. You will be prompted to enter a url source as seen in the screenshot below. 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: Now simply restart your iPhone and voila! you should now have a fully unlocked iPhone 4 or 3GS, running iOS 4.3.2 !