You know how when you get a scam call there's often a slight pause after you pickup and say hello?
Random little trick I've been trying for the last year or so - When I get a call from a unknown caller, I pickup the call but don't say anything.
I think the scammers must utilise an auto-dialler that only connects the call when it picks up on sound. No sound, and the dialler doesn't connect the call through to the scammer. Just hangs up, happens literally within 1-2 seconds.
I mean if anyone's actually trying to call you, worst case there'll be a confused silence, then a "Hello?" from the other end.
Obviously if you get a lot of calls from unknown numbers, this isn't going to help much (or just end up confusing the bejeezus out of your clients...), but for a personal number where the vast majority of people who call are 'known' numbers it works like a charm.