A:AnswerYes certainly you can use this device with your 100 Mbps plan. You would be future proofing your system so that in case if you decide to upgrade your internet service plan, you can still keep on using the SB6190 modem.
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
