Anybody know if you can you use a magic phone Jack on a DSL line?

Im actually happy with cox cable except for a few caaping download speeds way below where they were when I first joined when they were "AT Home " which really flew. But I am really getting fed up with the TV service I have. 50 bucks amonth and seldom anything worth watching.

So I guess the question should read Can I use a Magic Jack on DSL and / or FIOS?

Not sure, but the packages with the phone lumped in are pretty good, I have unlimited long distance all over the world and it was reasonable, plus the peace of mind that when I need to call 911 they will know who , when, and where if I cant speak.. Magick Jack wont work correctly with 911