Is there a simple way to use my cell phone, Samsung Instinct, with Nav system phone system in my 06 A4 Cabriolet? There is some kind of weird plug in console but I have no idea if I can just bluetooth into system.

 

I don't know about the nav system, but you don't need to use the plug for bluetooth. You just have to use the bluetooth functionality of your phone to pair with the car. I don't remember exactly, but it may attempt to pair automatically if discovery is turned on on your phone and you change the car mode to bluetooth (via the steering wheel "mode" button).

 

Bluetooth worked fine, I tested it with a call home.

Next question is about Nav system with voice commands. It says not available, is this because I have not activated the SIRIUS satellite radio yet, or is this a different service.