Yay! iPhone Dev team has finally released the updated version of Ultrasn0w to unlock iPhone 4 devices. As informed earlier, the new Ultrasn0w 1.0-1 works on iPhone 3G, iPhone 3GS and iPhone 4.
iPhone unlockers can effectively use this tool on following basebands -
- iPhone 4 baseband 01.59
- 3G/3GS basebands 04.26.08, 05.11.07, 05.12.01 and 05.13.04

Here’s a quick guide to unlock iPhone 4 using Ultrasn0w 1.0-1. Please note that iPhone 4 T-Mobile USA users will have to disable the 3G mode before unlocking the phone. This can be done by navigating to the following path.
Settings->General->Network
Guide to unlock iPhone 4 with Ultrasn0w 1.0-1
Requirements:
- Jailbroken iPhone 4
- Cydia
Steps to follow:
1. Open “Cydia” on iPhone 4.
2. Select “Manage” and go to “Sources”.
3. Select “Edit” and add following repo in the given space.
http://repo666.ultrasn0w.com
4. Tap on “Add Sources”.
5. Once you are done with adding the above repo, search “Ultrasn0w” or “Ultrasn0w 1.0-1” in Cydia directory.
6. Install the Ultrasn0w app on your phone, and it will automatically unlock iPhone 4.
7. Reboot the phone and enjoy your unlocked iPhone 4.
Also see:
- JailbreakMe 2.0 – An Ultimate Tool for iOS Jailbreakers
- Guide to jailbreak iPad with JailbreakMe 2.0
- Guide to jailbreak iPod Touch 3G iOS 4.0.1 with JailbreakMe 2.0


[...] many iPhone unlock users have reported Ultrasn0w battery issues to the Dev team members. Ultrasn0w 1.0-1 was released to unlock the iPhone devices running on iOS 4 and iOS 4.0.1 [...]