Unlock iPhone 3G 3.1 OS with Ultrasn0w
1. You must install Cydia when you jailbreak iPhone 3G 3.1
2. Launch Cydia/ Icy
3. Select Manage Tab at the bottom of screen and go to Sources
4. Press edit button and Add following Repo URL
http://repo666.ultrasn0w.com/
5. Once the source has been added press the large Return to Cydia button.If you manage to upgrade to iOS 4.2.1 on an iPhone 4 without updating baseband from 1.59.00 - ultrasn0w 1.1-1 will NOT work.
6. Go to repo666.ultrasn0w.com from the list of user entered sources and select Ultrasn0w from list
7. Click on Install Button and confirm the installation and wait for installation to complete
8. Now press the Home button then power off and power on the iPhone. You do this by holding down the power button for 3 seconds then moving the power slider that appears to the right. Press the power button again to turn on the phone.
9. That’s it, Now insert SIM card of your choice.
This baseband should in theory be unlockable, but it appears that ultrasn0w (or maybe mobile substrate) needs a small update to fix this problem.
So.. all iPhone 4 owners who rely on unlock, stay at 4.0.x or 4.1 (with baseband 1.59.00) for now. Do not bother trying 4.2.1 until a confirmed solution is available from the iPhone dev team.
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