GSM phone prep problem


Registered User
I have a 2004 A4 Avant with GSM phone prep, but can't get it to pair with my iphone 3gs or my old SE K850i or my sons Nokia C6.
The kit is dash mount with a cradle for the iphone. The cradle is charging the phone so I assume that's working ok, but I've a feeling that the GSM phone prep could be dead as VAGCOM comes up with "too many errors to continue" Can anyone help?