How To: Unlock iPhone 3GS, 4 Running on iOS 4.3.3 Using Ultrasn0w 1.2.3
iPhone Dev Team has released a newer version of Ultrasn0w. Those who rely on an unlock after jailbreaking iOS device running on iOS 4.3.3 using Redsn0w can use Ultrasn0w 1.2.3 to run iPhone on any carrier. Please make sure that before starting the below mentioned steps, you have jailbroken your iPhone. If you haven’t jailbroken your iPhone yet, follow the guide posted here.
Ultrasn0w 1.2.3 supports 01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00 basebands.
Once you have jailbreaked your iPhone follow the steps below for unlocking your iPhone using Ultrasn0w1.2.3:
1. Go to Cydia -> Manage -> Source
2. Now select the Edit and then Add a source ‘http://repo666.ultrasn0w.com’ , as shown below on the screen.
3. After the source has been added search for ‘ultrasn0w 1.2.3‘ and install it.
4. Once you install this app you can use your iPhone with any carrier.
If you find any difficulty during the unlocking process, do write us in the comments section below.