A:AnswerIt is not. This is a cable modem and ATT works via a DSL. Look for a DSL modem unless ATT requires you to use their modem (consult ATT). If you need to use their modem and it has the router built-in, I recommend adding a new router and putting the ATT modem in bridge mode. Google will pull up how to switch it to bridge mode.
A:AnswerThe TP-Link - Wireless-AX1500 Dual-Band Wi-Fi 6 Router supports the latest WiFi standards while being backwards compatible with older WiFi. Should keep you humming along for several years and is also pretty affordable.
A:AnswerNo. This is designed for a coax cable system not a fiber one.
For most operators using fiber those devices are more proprietary and your choices are severely limited.
A:Answerplease note that SB6190 doesn't have a phone jack in it. You can use a third party converter or you can opt for one of the voice cable modems like SBV2402, SBV3202, T25 etc. which are compatible for Xfinity's services
