I use bluetooth all of the time with my treo 700wx. I had issues similar to what you describe with the original BT. Once I upgraded to the Hannip version 95% of my BT issues have evaporated.
I use a Plantronics Voyager 510.
I previously used an HS-850 with other phones but I was getting to much echo/wind noise complaints.
Do you leave the HS-850 folded or un-folded when you answer the phone?
I would think if you left the 850 un-folded (ie On) and were wearing it you may have better success.
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