Airport Extreme & RG?

I just signed up for U-verse TV, phone and internet this past Saturday.  I’ve been on the fence a couple of months and finally signed up.  Currently I have ATT DSL split between a secured firebox for my wife’s laptop from work and I also have a Airport Extreme that my desktop windows computer is tied to, my HP wireless printer, 2 Apple TV2’s, my ipad and an iPhone.  I want to keep the Airport Extreme setup as it is as printing from the iPhone, ipad and computer works great.  My Apple TV’s work well also.  I know that AT&T will install a residential gateway modem.  I’m assuming that it will also have wireless capabilities.  I really don’t need a 3rd wireless network in my house.  Can it be configured to NOT have wireless without causing a problem with the TV or phone service?