Cox Comm - Internet Connection

[AAC2005]

I apologize if this has been posted before, but I have a question about a recent installation by Cox Communications:

I had Cox install a Motorola SURFboard cable modem, because I presumed it was needed for the digital phone service, which was added on to the TV and Internet bundle. However, I'm now finding out - duh - that I should have asked for a wireless modem or gateway for my laptop and TiVO. My question is - can I replace the Motorola modem with my "old" Linksys modem and wireless gateway setup without compromising the phone service, or am I at the mercy of the monopoly and will have to ask for a gateway from them?

At first glance, I didn't think there would be a problem because the Linksys system had been in use since 2007 without the phone service, but I need a second (or third) opinion.

Thanks!

(I should add that I just moved into a new house, so everything had to be done from "point one" - no existing lines, nothin'.)