[ame]http://www.youtube.com/watch?v=ppwwlJYdfY8[/ame]
A major iPhone security flaw was found recently. This security flaw allows you to bypass the "Enter Passcode" lockscreen and look at information on your device. Anyone can do this to your phone if it is in their hands. Your contacts, text messages, and maybe even emails aren't safe with this bug. Apple has noticed the problem and said it will be fixed in iOS 4.2.
To do this, simply go onto the Emergency Call screen, press "*" 3 times, hit call, then press your power button, and your in.