I was trying to find some updates on the progress on how to unblock baseband 3.10.01 and i've stumble upon this website http://www.UnlockGuide.org Jailbreak & Unlock 4/3G/3Gs With Latest iOS 4.1/4.0.2. They say it unlocks all, even 4.3! I have not tried it myself, so if anyone wants to try it and can let us know after would be great, thanks!
