i've very upset at the moment. i was given an iPhone at work to use and was busy erasing all the previous data and then started reseting it to the default state using the option in the settings menu. however, that was about 40mins ago and the iPhone has locked down on me and i can't get it to unlock or for the display to show itself again! pressing the Home button or any of the other buttons, power, etc. won't do anything... i know it's still on because when i switch from silent to normal mode or vice versa, it still vibrates. the only way i've been able to get the screen on again is to remove the SIM card and then it prompts me that the card is missing. it then goes blank again. i'm afraid i may have got myself in a non-fixable bug... my only option now is to wait for the battery to die, as i can't open it up to remove it physically... any help from anyone who has had this problem or knows a way to fix it would be highly appreciated! thanks in advance, Long.