I'm purely whitelist at this point. If I get a call and it's not from a contact I know, I send it straight to voicemail. Probably less than 10% of my phone calls are legitimate. The rest (2-3 calls a day) are vacation timeshare spam, "IRS" spam, solar panel spam, and some Chinese spam that I can't understand because I don't speak Mandarin.

Anyone who's important (including kid's school) is in my contact list, so I'm confident that I'm not missing anything important. And in the off chance it is important but not in my white list they will leave a message.