Our neighbor has a Comcast land line. I let her use our phone to call them when she loses service.
I have the Comcast phone line and it is the best landline I ever had in past 15 years. Yes it goes out when the cable does, but I do have cell phone for back up.
My regular land line with AT&T only worked for 5-10 days a month for the last year I had it. Calls to get it fixed usually got it going for a day or 2 then back out again. I had 2 land lines back then and the other one did work.
Later they just stopped even trying to fix it.