I'd like to have radio/phone control from my steering wheel on my 2007 c4s...does anyone know if there is an upgrade for this?

 

You may be able to add the multifunction controls to your existing steering wheel depending on which wheel you have. Or you can buy a wheel that already has them. Sometimes you can find them for cheap on Ebay.

 

You can add multifunction controls to the triangle steering wheel only: http://www.suncoastparts.com/product..._Interioraudio

The round steering wheel from 997.1 C2S/C4S cannot be upgraded to MF. The control module does not fit under the airbag. But you can swap the entire steering wheel/airbag combo to the triangle version.

 

Or for a 997.2 wheel with multifunction controls.