In combination with the VW radio RCD-310 my Golf 6 Team Edition can use the iPhone as the media storage device. When buying my car a USB to Media-In-Adapter was included.
The radio button are used to control the iPhone media and the hands are free for driving. When connecting the iphone with the media-in adapter in the middle console the external device was detected, but an error appears on the iPhone screen that the external device is not verified by Apple and can result in sound problems.
Volkswagen has an update on the website to update the radio.
I’m still locking forward the day we can update our car with an new firmeware by ourself.
Personaly I haven’t experienced any sound or other problems. It’s still low priced an can be bought for 36,20 online at the VW e-shop or the local VW dealer.