Confirmed. I've tried hard to make a Nokia N70 and a Nokia E60 to work with our X3 '06 (navi pro + bluetooth module), but they never coorporate. Forget about them, and any other symbian device
.
On the other hand, I've retried my SonyEricsson K800, and this time it worked perfectly. I've tried several combinations (turn car off, turn device off, etc), and it always worked nicely, with sound both ways and everything
much better than the K750