[mdon]

You can extract the certificate from the bgw210 and put it on a third party router. Then you don’t need the ATT modem at all. I did that last summer using this: https://github.com/mozzarellathicc/attcerts

[vel0city]

If their ONT and gateway are a single device it's not the BGW210. AT&T has been rolling out a newer gateway for over a year now.

[PopAlongKid]

BGW320 is what I got a year and a half ago, a single box.