I am now on my THIRD Treo 600. The first two were replaced because the phone would turn itself off and back on again, go out of service when calls were being made or received, and losing my programmed data. My third treo is only a week old and is dropping calls constantly. I have been happy with the phone when it works, but, reliability is a serious problem. Verizon Wireless has been no help either other than in replacing the phone under warranty which takes no less than 2 hours of my time and two days to ship. Battery life is less than expected and I'm usually recharging the phone by late afternoon. Another annoying feature is the low battery warning that must be cleared from the screen if you're trying to dial in codes to check voice mail or other dtmf services. It will interrupt you every 10 seconds. Also, the person on the other end can hear your low battery tones, voice mail notifications, etc. Annoying.