So I've tired VolumeCare and I've tried adjusting the volume in real player yet still have trouble hearing callers through the Handset.

Speaker and bluetooth volumes are fine. A phone where you can't hear the caller? Interesting.

On my second phone already; had same problem with the first.

Any suggestions anyone?

ps. dumping docs to go solves any hot synch problems you might be having. I kept getting restarts while synching with Entourage through an iMac. Dumped Docs to go and problem sorted.