Well, Irishman, my answer has to be selective rather than definitive:
Yes, you can if my experience in the UK with different models is anything to go by. Ever since the introduction of USB outlets in cars here, it has been possible to charge more or less any USB-connected device. I have used it for my iPhone and my iPod. BTW, that's all it can do - charge the device. You cannot play music or use the iPhone in any other way. To do that, you employ Bluetooth to sync with the car's audio system.
Caveat: I have never owned a Volkswagen.
Ian