I have recently purchased an iPhone 3gs from america and it was locked to an AT&T sim card. I have jailbroken it and downgraded it to iOS 4.1 and unlocked it. I am wondering on wheather I am able to upgrade it to iOS 5.0.1 without loosing it being ulocked? I have upgraded the baseband to 6.15.00 (iPad baseband) and it has sn0wbreeze installed which was required to unlock it. If anyone has ideas on how to upgrade it without loosing the unlock please it is apreciated.