Following the successful release of Comex’s JailbreakMe tool for all of the iPhone models, now comes an unlock tool that allows the iPhone to use any network.
UltraSn0w is back in providing all iPhone owners, include iPhone 4, a way to unlock the phone. Before any of this can be done, make sure the iPhone is Jailbroken and have the Cydia installed.
Below are the quick step in unlocking the iPhone 4, iPhone 3G, and iPhone 3Gs with the base bands (basebands 04.26.08, 05.11.07, 05.12.01, and 05.13.04).
1. Open Cydia
2. Add repo666.ultrasn0w.com to your sources
3. Install ultrasn0w, and reboot!
4. Now your iPhone should be unlocked. You can insert your T-Mobile sim in your iPhone and use your iPhone on T-Mobile.Unlock iPhone 4 w/ UltraSn0w; Supports iPhone 3GS & 3G too,