Here in France and for the 3dr A3, the bluetooth is a two-level option.
Option 1 is a phone cradle mounted directly on the dash next to the central vents. It powers the phone, sends the signal to an external antenna and routes the sound through the stereo. The cradle is aparently two pieces hoked together: one that is mounted to the dash and another that is phone-specific.
Option 2 requires the multifunction wheel. It allows the phone to be controlled from the wheel and displays the info in th screen between the gauges.