There is a Security Flaw with the iPhone running the Firmware version 2.0.2 this flaw potentially gives a person access to your email account and contacts when you have your iPhone locked. There is a quick but not permanent fix in the video
This video shows how to recover your iPhone if it is unresponsive or even getting ready to Jailbreak it, by putting it into DFU Mode.
17 Hidden Features for the iPhone and iPhone 3G, features only on the new iPhone Firmware 2.0, brought to you by MacComm.tv