PeterT, that looks very interesting, but I'm too sleepy now to study it. I'll look at it again tomorrow. Thanks!
My ISP is Time Warner Cable.
My cable modem is the Motorola SB6121 DOCSIS 3.0.
http://www.amazon.com/gp/product/B00768SBAU/
If this modem has a router, it's news to me! I can tell you that I am not paying for wi-fi service.
It would seem to me that I would be using the magicJack app primarily with 4G, which I believe is widespread in this area. But maybe I would have to become somebody's customer to use the 4G.