Just looked at our new decoder... The old one broke (again) so sky came out and replaced it. We are now on our 4th decoder!
We never bothered to have the phone line plugged into it before. I just noticed that sky used their own phone line filter when plugging in the phone line, and its an ADSL filter that provides it the ADSL filter connection. I always presumed that it would use a free calling or local calling analouge line to use any data services. So does sky require an ADSL connection to use on demand or certain features? How can sky only offer this service to certain consumers if so?