Router

I know I need Dos3. The cable comes as a single wire into the house, splits into the cable wiring in each room. That tells me that the land line coming in handles cable, wifi and land line.The current Modem plugs into the house cable wiring. I do have a land line. The wall mounted plug for the phone also ties into the back of the Modem. Time Warner has a list of approved Modems and I assume that would mean that they would work on their system. Some of the Modems on that list say "WiFi Modem" and some say "Internet Modem only". That makes we wonder if it would be what I call "all in one". As I said, I can not tell if the recommended ones are what I need for all three service but again, the description say "internet" or "wifi. I have looked at pictures of the back of 3 of the recommendations and none of them have a phone jack port but the one I have from Time Warner does.