What is necessary to return All-fi Hub CGW450? What is the contact phone number?

The instructions on the bottom of my router tell me to use "attadmin" (and a provided password) to access ATT Wifi Manager. However, when I access the router login window, the User Name field is already populated with the user name "admin", and it doesn't allow me to change it. I have tried changin

had to return a gateway........ They keep texting me that it's not been received.      Tracking shows it was received by them 10 days ago.      I keep calling the number & having to leave message or for them to return call  & now for 2 days no one has call

We just added Unlimited Premium w-50GB mobile hotspot on ONE line because we’re in a rural area deemed “unserviceable” for home Internet. Want to use this new mobile hotspot to power an iPad and doorcam. But I guess it’s not usable for the whole family unless my phone is in the vicinity? And mobile

I am trying to limit the address pool for my local network on my Pace 5268AC. When I try to set the address range manually, I get an error saying "The manually configured DHCP range is not within the specified subnet."  I'm attaching a picture with the settings I'm using.

I have set the remote access, like https://76.2XX.XXX.XXX:45678/ Then when I tried it from a computer within the LAN, it failed. It seemed a hairpin issue, isn't it. Does ATT allow the hairpin?