A:AnswerYou can probably use it as an access point, but you’re better off buying a much less expensive gateway that is designed to do what you want. You could also use this instead of the modem/gateway provided by your ISP.
A:AnswerThis is for cable modem, not the traditional one you are talking about. This will definitely not fit.
You should look for DSL modems. To be sure look for the specific service you have and then find the right modem.