Hi, I'm on Sky Broadband. When I had my Sky+ box connected to phone line, it would slow my BB right down so I got round this by leaving the Sky+ disconnected to phone line.
However, when i 1st got my HD box installed, I also went with multiroom. By having multiroom, you MUST have both boxes connected to the phone line all the time so they know you're not selling it on to friends etc. This meant I had a problem again.
After some looking around on the internet, I came across Skyuser forums which were extremely helpful. By reading these I discovered I had to remove my 'ring wire' from the main socket (the one by the front door usually). I did this and ever since it has worked a treat.
I'll have a dig to see if i can find the links i used.
EDIT: see here for ring wire advice....
http://www.skyuser.co.uk/forum/cabli...rminology.html
Ring Wire. Many years ago, in the UK, the component that makes a phone ring was placed in the socket rather than the phone (which is more common in other countries) - this helped stop other phones in the house making noises when a phone is dialled using the old pulse dialling method. However for this to work there has to be a third wire in addition to the "twisted pair" used for the voice connection. In most circuits the twisted pair are "blue/white" (blue with white rings and white with blue rings) and the third wire orange with white rings. This isn't always followed though. One problem not foreseen in the early days was that this third wire acts as an enormous source of noise and noise is bad news for ADSL. A solution is simply to disconnect this wire (terminal 3) on the NTE5. Some modern phones will still ring as they now contain the "missing" component. If in doubt, all phones will ring with a dongle attached. Note that disconnecting the ring wire should not have any beneficial effect if a filtered faceplate is fitted. Some people say it does though so if you still have noise problems after fitting one it may be worth trying.