I have heard from stories over in the UK that customers that sign up for the Multi-Room (SKY HD Decoder + Normal Decoder) must periodically do a 'callback' to the Sky Servers to confirm they are at the same address.
Have talked to my grandfather who has been with Sky TV since they first launched in NZ and said he has never heard of this - the customer service reps decline to answer or say they dont know.
So my techie friends - whats the answer? Because i dont have a home phone line to do the callback sky are going to disadvantage me? thats unfair, totally unfair.