Hey everyone, Ok so I used Jailbreakme.com for 4.0.1 then added the repo for Ultrasn0w and unlocked my phone (turned off 3G). Question: Let's say when, hypothetically, iPhone 4.5 comes out and I want to update it, can I restore the phone in iTunes - upgrade - and re-Jailbreak and unlock again? What exactly does the unlock do? Lock the modem firmware? Changes the baseband? Thoughts. Thank you so much everyone! I will do my best to help other people and keep this community growing! Thank you again!