I’ve been looking into these things. Couple of things seem to pose a problem. My place was only built in the last 2 years so I’d assume the wiring is fairly decent. Secondly, the plate on the wall where my main telephone connection is, also includes connections for the Sky dish and the tv aerial.
Depends who built it, when, with what etc – too many variables, just open up your faceplate and have a gander. I didnt even know it existed until my father (ex BT eng.) removed theirs, first thing I noticed was sync speeds going from 1500 to 2800 abotu a week later (I have my server at their house so look at stuff like that a lot lol).