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The phone line should go into the modem. The nest is a router. You currently have a gateway which is a single device that can do the jobs of both a router and a modem. If you own a dual router and modem device, then it will connect your ISP's network to your local WiFi network or Ethernet. In this case, gateway may be interchangeable with a default gateway or primary router, in which case you don't need the nest. However, you might be paying AT&T or your current ISP extra money for this device. Check your bill. If so, call them and arrange a return and get your ISP to send you a simpler modem but remember, it still needs to support a phone line - then plug the nest into the modem. You may also need to get an ethernet switch to connect additional devices to the ethernet switch.
I would recommend:
Sorry, there was a problem. Please try again later.I have the same situation with Spectrum and I just left their router in line and came off of the Spectrum Router (with telephone) to the nest spread router system. Everything works great.
Sorry, there was a problem. Please try again later.Your landline won't be affected when you setup Nest Wifi. You just need to connect Nest Wifi directly to your modem's WAN port to set it up. Take a look at this link for the setup requirements and guide on how to setup Nest Wifi: https://support.google.com/googlenest/answer/9548301 Since you have a AT&T U-Verse Model 5268AC which is a modem/router combo, we recommend disabling the Wi-Fi functionality of the combo or putting it in Bridge mode to avoid Double NAT as it may cause connectivity issues. You can check this link for more details: https://support.google.com/googlenest/answer/6240987
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