Bad news for the people those are planning to buy Gevey SIM to unlock their iPhone 4 on basebands 2.10.04 / 3.10.01 / 4.10.01 . MuscleNerd, the member of iPhone dev-team has confirmed that Gevey SIM is illegal in USA and probably other countires as it dials 112 (emergency) then hang up. As we know the carriers blocks the SIMs that are causing the repeated emergency call hang ups, so if you change the blocked SIM numerous times then the carrier will ban you.
That “dial 112 then hang up” in gevey http://is.gd/FGNeJi is illegal in USA, and probably other countries. Buyer beware.
According to MucleNerd, Gevey SIM unlock is illegal and there is no way available to make Gevey SIM method legal. So if you want to unlock your iPhone 4 then you have to wait for software based unlock from dev-team. It is not recommended to use Gevey SIM for unlocking iPhone 4. You can get more information about Gevey SIM from here.