Does anyone else have problems with callers not hearing you when you use an earpiece? I'm starting to think that my earpiece microphone volume problem isn't a problem with my earpiece, but a problem with my treo. When I use the built-in microphone on the unit, I come through loud and clear.

I've tried 6 headsets from all different companies and everyone I talk to on all these headsets has to turn their volume to full to barely hear me. Is there someone wrong with my treo? Anyone else? I've never had this problem with previous cell phones.