Sky require you to have a phone line for multi-room because they want to be able to check that the box is still at your address… To be fair to them I bet loads of people have had a second box and given it to a friend for £10 a month maybe more.. Sky World costs about £40-50 a month and if you have multi-room you could give it to a mate for £20-30 a month… Everyone wins.. Except Sky..

The second box needs to make a call to sky every month or so to avoid the extra charge from sky.. You can do this manually but it needs to be plugged into a phone line.. But it only takes a minute of so.