When the car Navigation System starts up, I see a message indicating successful pairing 95% of the time.
To date, only 1 call successfully received hands-free via bluetooth. Most calls don't show up as ringing on the nav system. If I answer the phone directly, the nav system kinda indicates the call is in session, but no audio via car's speakers, and the Bluetooth connection to the car closes shortly after that. Could this be a weak T-Mobile cellular signal and not a Bluetooth problem?
My former Motorola Droid X (Verizon) phone under Android 2.3.4 had incredible/flawless bluetooth connectivity in this car.