Good point, and it is quite possible they do not have landline service. We keep ours, partly because we have DSL, and partly because the phones stay up, even in the worst blizzard (buried lines). Cell service was compromised in a blizzard we had a few years ago which knocked out power to 6000 square miles and disabled cell towers. So we keep the landline.
I too still like land lines, much better quality...I’ll stick with it too.