I have a jailbroken iPhone 4 on 5.1.1. I am going to work at a camp where I cannot have a phone, but if I turn in my SIM card I can still use my phone for games, music, etc. I am going to get around this by giving a decoy SIM and keeping my normal one. Is there a way to display No SIM on the status bar w/o showing any signal bars or 3G/edge? I know I can customize the text, but not the signal bars.