BlackBerry 7130e

Researching an issue for my boss. He has a Blackberry 7130, a Motorola H70 Blue-tooth Headset, and a Motorola Premium Bluetooth Wireless in-car kit. His provider is Verizon. He has been having horrible problems with echo on calls (both incoming and outgoing) and has already returned both the 7130 and the H70 once to see if that would remedy the issue. The devices seemed to work well for a while, but the echo has reappeared. It's not consistent on every call, and it happens on both calls to/from cell phone and land line.

Have any of you had like issues? If yes, what did you do to resolve it? The in-car kit works great, he's had better luck with the second H70, and he appreciates the functionality of the Blackberry, but the echo is so distracting on the phone that it seems to render the phone feature useless.

My sister also has a Blackberry, and what I've noticed is that, absent the Bluetooth, it picks up far too much background noise. My boss has also indicated he doesn't have the problem when he uses the Bluetooth, so it appears to be just the device itself.

We'd earnestly like suggestions for remedying the echo.

Thanks in advance.