The following instructions will show you how to unlock the iPhone 3G and iPhone 3GS so you can use it with any GSM cellphone carrier using UltraSn0w.
You must have an already jailbroken iPhone before you can continue to unlock it. Also, you must be on the 04.26.08 baseband(modem firmware). Which means that you must be running the 3.0 firmware and have used PwnageTool or RedSn0w to jailbreak it.
To find what are your firmware and modem firmware(baseband), you can follow this tutorial. You need to follow one of the following tutorials before unlocking, if you are not on baseband version 04.26.08: Mac, Windows
If you are on T-Mobile, remember to turn off 3G before starting…
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