Well, I just quickly tried pairing my phone with my car's inbuilt BT today. It did that with no problems at all, but I could not bring up my phone's contacts on the car's display. It didn't show any errors though, just said "No entries in phonebook". I don't know if I didn't wait long enough (I was in a hurry), my previous android phones sometimes needed several minutes to do a full sync.

Otherwise, calling worked, as well as browsing the incoming and missed calls lists.

Edit: went to see the paired devices list on the phone and for the connection with the car it lists supported profiles: SPP OPP FTP HSP A2DP HFP