I am thinking of switching from Sky + to Sky HD. The self setup instructions say you need to connect a phone line to activate the HD on setup. Once this is done can you disconnect the phone line? Does the phone line have to go into a broadband splitter or straight to the old BT socket? I use the Sky + without any connection. I don't want to get a dual adaptor or new socket if the phone line is only needed for initial setup and not for ongoing usage.