I dropped the landline and went cellular about a decade ago. One nice thing about cellular is Caller ID. I use the Truecaller app to screen calls. If I don’t know who is calling, I do not answer. If ‘they’ want, they can leave a voice message.
And you can go to someone like Whitepages.com, put in the number and see if it's a spam call. Most of them are so then you just set up a “contact ( I have them listed as “Assholes”) and then I block it. Sure am glad I bought my iPhone with the maximum available memory installed. We're going to dump our land line because it's expensive to screen incoming calls. AT&T exacts monthly fees for caller ID and they don't have a decent system for blocking them for the future. And they are the pr!cks who sell the telemarketers their DID lines which are then used to harass us all.
Landlines have Caller ID too. I work at home, and have a landline for business and a mobile phone for personal stuff.
My landline phone displays caller ID, but so does my cable TV, which I keep on with no sound all day just for the landline Caller ID function.