I have had my 650 with Cingular service for about 4 months. It has been a mixed bag so far:The bad:- I noticed that the phone would turn off (not sleep, but the phone service would terminate) whenever I put the phone into a belt clip. After about a month, I figured out that the clip was contacting the cover of the sim card slot, causing it to jiggle or something, and making the phone turn off. I now have found that if I tap the phone with my fingernail, or lay it down on a hard service with even a minor impact, the phone turns off. This is an incredibly poor design. This should have been caught during testing. I work on other kinds of consumer products, and I am confident our testing would have caught this.- The vibrate mode is so weak they might as well not have it.- I get notified of missed calls, when the phone has been on, with me, and in an area with good reception. Why didn't the call come through?The good:-Worked well in India, the Netherlands, Russia. Calls and data came through fine.