Taken from Skys T & Cs
Quote:
General: Your Sky box(es) must be connected to a fixed telephone line for 12 months. Sky+HD box supplied may vary from box shown. Sky+HD box prices may vary if you live in a flat. You must get any consents required (e.g. landlord’s). Minimum Sky TV/Sky /HD Pack/Multiroom subscriptions 12 months. You must be 18 years or over. Channels/programmes & prices subject to change. Prices shown apply to customers paying by Direct Debit. For continuous debit/credit card mandate, 50p monthly charge applies. Information only applies to residential customers in UK, Channel Islands and Isle of Man. Further terms apply. Calls cost up to 6.03p per minute (plus 10.11p connection fee) for BT customers. Calls from other providers may vary. Correct at 16 March 2011.
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I think it is for the interactive services, you will be more inclined to use Pay services if you can just press a button on your remote to pay for it. I am sure they discount toe price of the install for thi, a friend of mine without a fixed line got Sky+ installed but had to pay more. Hope this Helps