After releasing redsn0w 0.9.10 b6  to jailbreak iOS 5.1,  Most of you are wondering how to unlock iOS 5.1 with Gevey Sim ? if you use Gevey SIM to unlock your iPhone 4 on unofficial carrier and you are one from who interested in the newly iOS 5.1 which released in the new iPad Media Event, so you have to follow the below procedure to keep your Gevey SIM working on your iPhone 4. Let's check the guide after the jump.