I am trying to set up Internet at a new place with AT&T (U.S.). The online process requires me to pay $10 per month for a thingy they call "WiFi gateway" which they claim serves as "both a modem and a router". There is no option to skip it or un-check the box.
Searching for answers online I saw some posts claiming that "10 bucks isn't for the router, its not even for the modem - its for the Fiber to Ethernet converter box that you cannot buy. That's why even if you have your own compatible modem/router they can still charge you the $10."
Why does AT&T require this while other ISPs I have used do not? What exactly is it? How is it different from an ordinary modem (or modem/router combo)? If I don't want to pay that $10 can I just get a modem with an ONT port?