My phone was dead for approximately 30 min today. I was using it to surf the internet. Left it in the car for 5 minutes to help my friend clean his car off from snow, came back and it was dead!!!!!!! Nothing worked, plugged into computer, nothing, plugged it into charger nothing, pressed both buttons, nothing. Read Apple support, nothing. Then eventually pressing the Home button and the power button finally worked and all is well. That was scary.