These are instructions on how to unlock the iPhone 3G for use with any GSM cellphone carrier using UltraSn0w.
Before you can follow these instructions you must have a jailbroken iPhone and you must be on the 04.26.08 baseband(modem firmware). This means that you must be running the 3.0 firmware and have used PwnageTool or RedSn0w to jailbreak.
To find your firmware and modem firmware(baseband) versions you can follow this tutorial. If you are not on baseband version 04.26.08 then you need to follow one of these tutorials before unlocking: Mac, Windows
If you are on T-Mobile remember to turn off 3G before starting...
Step One
Press to launch Cydia Installer from your SpringBoard.
Step Two
Press to select the Manage tab at the bottom of the screen.
Step Three
Press to select the large Sources button
Step Four
Press the Edit button at the top right of the screen.
Step Five
Press the Add button at the top left of the screen.
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