RobertWy wrote: See if this helps: https://internet.xfinity.com/help/articles/Frequently-Asked-Questions
You would think that an FAQ page would be accessible to all, but not so. I don't have a Comcast xFi gateway, and for me that link redirects to https://internet.xfinity.com/not-eligible, which says:
Upgrade for This Experience
To access xFi, you'll need to upgrade your service/equipment.
Why would I need to get an xFi gateway before I can see the page that tells me if and how xFi gateways handle Guest access???