I have been using mu iPhone 3GS for some time now without a hitch until, when asked to enter the four digit passcode, it told me that my passcode had expired and I needed to enter a new one. None of my colleagues who have the same phone have experienced this issue. If I try and 'Change Passcode' and set the phone to the old passcode (I prefer this one as I can remember it more easily), it says "this passcode has been used too recently". Has anyone else stumbled across this issue and is there a way of getting back to my old passcode? I have looked in the Prifiles installed on the phone and none of them (2) seem to have ant restrictions/conditions associated with passcodes.