UltraSn0w Unlock for iPhone 4 iOS 4.0.1
 

The iPhone Dev-Team has released an update to UltraSn0w that includes their much anticipated unlock for the iPhone 4.

To perform the unlock you first need to jailbreak your iPhone 4. You can find instructions on how to do that here. Once jailbroken you can follow instructions to apply the UltraSn0w unlock to your iPhone 4.

Version 1.0-1 of ultrasn0w now works for:
● iPhone4 baseband 01.59
● 3G/3GS basebands 04.26.08, 05.11.07, 05.12.01 and 05.13.04

A big thanks goes to all the members of the iPhone Dev-Team for their hard work!
http://i38.tinypic.com/2eewxtd.png

Step 1: Jailbreak your iPhone using JailbreakMe.

Step 2: Go to Cydia and search for UltraSn0w. If it’s not there, you might have to add the following repo: repo666.ultrasn0w.com

Step 3: Install UltraSn0w.

Step 4: Reboot your iPhone.

Done! Your iPhone should be unlocked. You can now pop in any SIM card. If you unlocked an iPhone 4, you might have to trim the new SIM so it fits in the tray.

Because the iPhone doesn’t support T-Mobile’s 3G frequencies, T-Mobile users in the US should turn off 3G in Settings > General > Network.