The iPhone Dev-Team has released the ultrasn0w i.0-1 unlock for Apple iPhone 4 with iOS 4.1 and 01.59.00 baseband. The following are the detailed tutorials. Of course, first you need to have a jailbroken iPhone 4. Jailbreaking your iPhone 4 is as simple as reading the right tutorial. You can follow our limera1n and greenpoisOn tutorials to jailbreak your iDevices.
1. Start "Cydia" on your jailbroken iPhone 4.
2. Touch on "Manage" tab on the bottom, and then select "Sources."
3. Click on "Edit", and then on "Add" - Type "http://repo666.ultrasn0w.com" and click on "Add Source" to add.
4. After installation is completed. Install "ultrasn0w 1.0-1" from Cydia. Cydia will now automatically update your sources.
Restart your iPhone 4, and then enjoy your unlock iPhone 4. Please Note: unlock your Apple iPhone 4 iOS 4.0.1 with Ultrasn0w 1.0-1 at your own risk only.