Most landline phones are really IP phones now, unfortunately.
Mine isn’t. Landline is, to ME anyway, hard wired, because I’m that old. :)
I am nearly the last in my neighborhood to keep theirs, and that’s why I saw what good advise this is.
A couple of years ago all the internet, IP services here went out for a day. I was the only one who could actually use a phone, lol. My next door neighbors had just switched to a bundle - and had no access to their (IP) phone. They had two elderly parents they were caring for, so I told them about our land-line in case of emergency.