You DO NOT use any type of cable, satellite service to use Magic Jack.
You will only use your router for hook up. No longer do you need to leave your computer on. Then plug the little magiv jack unit into a electric wall plug, simple as that.
Register the unit online and choose your phone #., Also there is and INSTANT CHAT box available, and I do mean INSTANT. On installing I had a few questions, asked them and within 5 or so seconds I had them helping me.
If you do purchase the Magic Jack, DO NOT purchase the extended warranty at the store, it is available on their website when you register.
You will not regret giving up your land line, whats the worst thing that can happen? You purchase, hook it up and if it don't work take it back. Keep your old land line in tact in the meantime.
What is your router connected to?