My grandmother (80s) and her circle of friends all use landlines to communicate. Technically her's is a VoIP line since about six months ago, but it's designed

My grandmother (80s) and her circle of friends all use landlines to communicate. Technically her's is a VoIP line since about six months ago, but it's designed as a drop in replacement (uses the same phones/numbers) so I wonder if there's a possibility the attack is still open. I also use a landline fairly often (mostly out of habit), and most companies only have my landline number as I don't want them contacting me while I'm out/busy. You're right that it's a dwindling number, but it's certainly not at zero yet.