Yesterday, I pushed the home button on my iPhone 3G 16 gig. The screen flashed and went blacked. It was like it was dead. No key presses or combinations would have a response. Eventually it came back and rebooted itself. But ... when it came back, the screen had the picture of a USB cable and iTunes. Implying "plug me into iTunes". If I moved the on slider switch, it went to a emergency calling screen. It also said no service in the top left. When I got home, I plugged it into my computer and it said something about being activated. The phone then started working properly. Any one ever seen this?