I have an unlocked iPhone 4. It is running OS version 4.2.1. The issue is that with my last update and subsequent unlock, I have lost face time. No matter what it does not appear when I make a phone call, nor can I find it in settings to turn on or off. I have also lost my network settings, but have managed to fix that having SB setting initialised. Has anyone else had this problem? I am really confused as to why these have both disappeared.