You still have a landline?
I certainly do. Cellphones don't work at my house or anywhere near it.
VOIP can work fairly well under the right circumstances, but I lose cable internet vastly more frequently and for much longer times than I lose landline service. I also lose power quite frequently, sometimes for weeks at a time. I'm obligated to be reachable and to be able to respond to pages on my beeper (yep, those still exist, and are extremely reliable), so... landline.
I actually have an old rotary-dial traditional phone under the bed that I can plug in when the power goes out. It works so reliably when the power is out that I can't recall the last time I didn't have phone service.