The guy who installed Sky at my place said that Sky tell their installers to always install a phone socket unless the customer refuses. "Even if you have to tack the cable along the skirting" was what he was told. He thought this was because they make so much money from pay per view movies and people are less likely to order them if they have to call the 0800 number rather than just use the remote control.
Ok lets be fair, below is from FAQ on Sky NZ site, they are direct and honest . Sometimes I wonder if people are too quick to put the boot into our providers...I believe they are getting better
A landline is not required to get Digital Installed. In order to book Pay Per View through the remote, an active landline and phone jack must be installed. There are other methods to book Pay Per View - through a Customer Service Representative and/or calling 0800 759 759.