This is a modem/router for ADSL connections, not cable.

No, this item has no coaxial connection port. It contains four RJ-45 connections and one RJ-11 connection.

Comcast uses a coaxial cable to provide your internet signal. This modem uses an ADSL signal. So no, this will not work for your uses.

Yes, it is compatible with all major DSL Internet service providers.

No it does n't

Yes.

You can run both a MiFi and a WiFi router without any problems. In the rare case when these two are conflicting, just change the channel in your WiFi router setup and it will resolve the issue. However, it's highly unlikely you'll have any kind of conflict.

If you can go on line the ooma website will provide the instruction

Yes

This device will be Great for the connection you are looking for. The router currently connect me to my service provider at 105mbps download. If you need a modem you will have to get that as a sperate device is this only a router. Comcast should provide a modem. I do not recommend getting a two in one modem/wireless router. They do not seem to perform well.

You can't. Centurylink does DSL. This is a cable modem intended for use with cable companies. You need a DSL specific modem for Centurylink.