I used to have an answering machine and got several hangups
every day. When I heard a decade or ago that scammers would sell lists of legitimate numbers I tossed it into the bin. Within a few months my scam calls had dwindled to only 15 or 20/wk. As a senior I'm getting 2-4/day again, 'just like old times'.
When I gave in to family/peer urging to get a cel phone I kept the land line number/phone with caller ID and limit who I give the cel number to, assigning names to numbers of those (too many) I know and care to hear from. I also regularly leave the iPhone 5s on the table next to the 'wired' one, and rarely carry it.
It costs me ~$100/mo to have both lines, and IMO it's worth it. I don't need to hear from scammers OR acquaintances who are bored (nothing good on TV) when I'm not (my 'reality life'). I Google every number that doesn't clearly identify its source (kind of a hobby by now :laughing

Some of these clowns spoof numbers that caller ID says are 'not in service' and my favorite using the
same number I'm answering.
Years ago when I might answer an unwelcomed call I'd just lay the phone down and come back later when the default noise alerted me to a 'not active' phone off the hook. I did talk to a few scammers back then, often answering with "scam call hotline. Are you calling to report or to confess?" Sometimes I'd answer "make me laugh" though 'Rachel' never did. I'm registered at Spokeo, and some numbers are so off-base that typing in a 10 digit number produces only addresses instead.