The first rule of avoiding scam calls is to never answer unknown numbers, and even some known ones.
Curious? Bored? Worried it’s an emergency? Wait the extra minute it takes for the call to go to voice mail, then decide if it’s legitimate.
I wrote a bill aiming to improve this a few years back and was told that people try basically every year, but it's impossible to do anything about it at the state level and very difficult at the federal level because they mainly originate outside of the US...