some more useful posts I've found:
"All the Nseries and Eseries phones have RSAP as far as I know since this is in fact a feature of S60. I know for a fact that my N73, N95 and N96 do.
Go to this page:
http://www.forum.nokia.com/devices/matrix_all_1.htmlSet the "Devices filtered by" to S60, and you'll get a list of S60 phones.
Since the 6230i does this too, it's reasonable to assume that all S40 2nd Ed. phones and later do it.
In other words, pretty much every Nokia phone available on the market today must have this ability.
If there are any particular models that you're considering, we can probably find out if they have the RSAP profile. "
Looking at the Nokia specs, I believe it is the "SAP" feature under Connectivity>Bluetooth Profiles which determines whether the phone is compatible with the VW bluetooth kit.
Also there is a list here of SAP phones, in German, but scroll down and you can work it out
http://de.wikipedia.org/wiki/RSAP