So I just got a plantronics 510 yesterday and quickly paired it with my Sprint treo 650. I'd read that the 650 and 510 work well together. The functions work fine and the earpiece volume is more than adequate, but I've done a few test calls and people have said it's hard to hear me. Can anyone offer any suggestions? I've read the manual, but maybe I skimmed over something.

I also have VolumeCare, but I don't think that works with BlueTooth.

Can anyone help??