... The N900 does not support one of the most usual ways to transfer contact information over Bluetooth to a hands free device. It's the closest thing to a standard that isn't officially a standard. That it would not be compatible with my car HU was impossible to find out without buying one and trying it for myself. I had an idea that it might not be, because I have that experience with other products, but there was no amount of searching that could give me the answer unless I started to study ALL the bluetooth protocols to find out which one used to be used to transfer contact information over bluetooth. Infact, the only answer if it was compatible or not, on the internet, exists on this site. And I wrote it. To myself. ...