Hi, I have a query regarding my Iphone 3GS - which is jailbroken and unlocked. ver-4.0, modem firmware -05.13.04 (duno if these details are enough). After its been unlocked I have never updated the IOS from Itunes as I fear if i Update I might loose the unlock facility. I am not sure if right, please advice. My iphone has gone really slow and froze quiet often. I believe its due to no updates. So can i go ahead click download new itunes and new OS will i loose the jailbreak & unlock facility ? please advice. tuna.