As MJH says they force you to get the advanced phone prep if you order the screen. This causes problems:
1) Together these options cost about £600... that is the biggest rip off ever (for comparison my Ford got its front screen for £100 and it is a fancier set up than the VW one).
2) The phone prep actually removes functionality for iphone users instead of adding it.
I don't buy the VW reasoning about the screen blocking phone signal, its clearly horsesh!t they are peddling. Here is one reason why, the phone signal is uninterrupted though the side windows!
If they were being fair instead of money grabbing then either the currently offered laminate headed screen, or a more traditional wire based heated screen, would be free, or failing that included in the winter pack.