I have two 6310i's and two cars. One car has the Nokia bluetooth car kit and both phones work fine with that. The other car has the Mercedes Benz car kit for Nokia 6310i phones (a european car kit, not like the motorola one found in the states) and both phones have worked fine with that. (It's a plug-in cradle, not bluetooth). Saturday one of the 6310i's stopped working with the Mercedes Benz car kit. The other one works fine, so I'm not blaming the car kit. I've tried cleaning the contacts w/ a pencil eraser but that didn't change anything. Everything else about the phone seems to work fine (except it seems to suddenly need a new battery because a charge is only lasting about a day). Any ideas about why my phone would stop working with the car kit? Thanks!!!