Apple has your unlocked iPhone in their crosshairs. What do you do? Here’s my first go at a re-locking guide. I’ll update and confirm as time and feedback permit. This method in no way guarantees that your iPhone will survive the update after being unlocked.
http://www.tuaw.com/2007/09/24/how-to-relock-your-iphone-before-the-firmware-update/
They are preparing. Steve Resistance is FUTILE!!