Step 1: Download iLiberty.
Step 2: Turn the device off. (hold the sleep/wake button on the top right, then slide to turn off when prompted)
Step 3: Open iTunes on your computer, next, hold the Home button (round button on bottom) and plug the iPhone into your computer. Keep holding the button until iTunes pops up a message saying that it has detected an iPhone in Recovery Mode.
Step 4: Once you have accomplished this, hit the restore button.
Step 5: After iTunes downloads and restores the phone to 1.1.4, it will bring you to the activation screen. Don't do anything.
Step 6: Open iLiberty.
Step 7: Choose to Unlock, Activate, and Jailbreak. (also click the unlock with 3.9FB box)
Step 8: Don't touch anything while it goes through the processes. This may take a few minutes.
Step 9: When it is done, it will tell you. Now just pop in your already active T-Mobile SIM card and you are done.
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