For those of you who don’t know, Gevey SIM for iPhone 4 basically works by forcing the activation of the baseband using the emergency dialer, and it is also said to be vulnerable up to iOS 4.3. You can read more about how it actually works by navigating to this link here.
If you are tired of waiting for software-based unlock, you can get this mod to unlock your iPhone 4. However we at Redmond Pie wont recommend it due to its current legal status. Dev-Team is still working on an unlock solution. We suggest to wait for the 40-bit NCK hack for iPhone 4 by the iPhone Dev-Team.
(Thanks to Anthony Ngo for sending this in!)