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Unfortunately, I found that while my Sky+ was connected to the phone line, it drastically reduced my broadband speed. After my initial year was up, I disconnected the telephone connection to the Sky box and rate went up by 1mb. Annoying but true. Hope yours is not the same.
I had that too, but my Sky (ordinary digi) box has been unplugged from the phone line now for just over 1.5 years now. Infact maybe much longer come to think of it.
It was creating a lot of noise at times, not on the phone itself but for the Broadband. Lots of signal interrupts.