I wanted to come here and let everyone know that if you are having poor to non-existent bluetooth phone connections in your VW with your Android phone running the current OS, there appears to be hope on the horizon. I had resigned myself to just accepting the fact that my 2010 CC would never be compatible with the Bluetooth 4.2 spec in the latest Google Nexus phones but...
I decided to install the latest preview version of Android N (7.0) on my Nexus (preview = beta) and to my pleasant surprise, the bluetooth phone connection now works flawlessly.
Hope that helps those of you who have experienced this problem... I'm back to loving my good ol' nav-radio again.
(this is not a problem on every Android phone or every VW)