So Im at my local apple store right now. My iPhone has the glass not sitting flush issue. The Genius aka a nice friend replaced it, and it was fine. I asked him about jailbreaking, as mine was until I restored it. He said that even when restored, it still keeps that info. I did a DFU restore. He claims that when plugged into the MacBook they had, a program called behavior scan will detect the iPhone has been jail broken, even it you had erased the phone through restoring it. Behavior scan is really cool. It tells you EVERYTHING abut your device. He refused to plug mine in, As when then program detects the jailbreak, it send the info along with the serial number to Big Steve, and Apple HQ will void the warranty. He has a jail broken iPhone too. So do several other employees. Just chiming in to let you know about the info I found out tonight. PS I typed this on a demo 16GB iPad 3G.