Earlier we reported Ultrasn0w 1.2.4 for iOS 5 unlock on iPhone 4 and iPhone 3GS. As we mentioned earlier that Ultrasnow, the software based unlock solution is not compatible with all basebands, so here comes GEVEY SIM to unlock iOS 5.
Good news is that Gevey SIM can unlock iOS 5 on iPhone 4 and iPhone 3GS but you must need to have a preserved baseband.
First of all you need to know on which basebands Gevey works. If you have iPhone 4 with baseband 02.10.04 / 03.10.01 / 04.10.01 or iPhone 3GS with baseband 05.14.02 / 05.15.04 / 05.15.04 / 05.16.01 / 05.16.02, so it means Ultrasn0w is not going to work and you have to use GEVEY SIM.
Then you need to have a preserve baseband that is you have to make sure your baseband is not updated while upgrading to iOS 5. You can follow the below link for this purpose. The link below also helps you to jailbreak your device on iOS 5.
How To Jailbreak iOS 5 After Creating Custom Firmware & Baseband Preservation
How To Unlock iOS 5 on iPhone 4 & 3GS with Gevey Sim:
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