The Apple server are closed ! time is over ! It dose not work any more
What do you need: A jailbroken iPhone that can be activated in iTunes (that is, not officially blacklisted), a computer with the latest iTunes installed and working internet connection. You will also need to know the carrier that your iPhone is locked to.This will unlock all basebands like 4.11.08 , 4.12.01 ,1.0.13 ,1.0.14,2.0.10
Updated with new solution
To unlock your iPhone 4 on iOS 5 with Gevey SIM you MUST update your iPhone 4 to pre-jailbroken custom firmware to preserve the unlockable baseband which are compatible with Gevey SIM.
The popular Gevey SIM Unlock solution for iPhone 4 has been blocked by Apple in iOS 5 beta 2. Gevey SIM works fine on iOS 5 beta 1, but MuscleNerd of the Dev-Team has confirmed that Apple has patched the exploit used by Gevey SIM to unlock iPhone 4.
Well, Today Gevey SIM card has just released Ultra SIM which will unlock iPhone 4 without dialing maunally 112, yeah that’s great This method of unlocking was detailed by Laforet in a recent blog post. Depending on your location, calling 112, even for a split second, could be illegal.