Last week I was traveling from AZ to San Carlos Mexico for a dive trip. On the way down I put my phone into airplane mode to conserve battery life. Before leaving the states I turned off airplane mode but the phone would not work, the HTC Sense was crashing every second, essentially bricking the phone. I tried removing the battery but nothing would work. I left the phone powered down for the remainder of my trip and when I returned did some searching to figure out how to reset the phone. So, for anyone else that might need to do a hard boot of their phone, here is how to do it. With the phone turned off, press and hold the down volume and the send (green) button. Keep them pressed in while you power on the phone. Follow the on screen instructions. In my case the phone came back up and I was able to accept the OTA update to 2.1. The phone has never worked so good.