Also just a note. It’s better to silence the ringer than immediately reject. Some spam systems will register the reject since it doesn’t ring the full 4 times and it’ll mark the number as active. (Even worse sometimes they’ll start calling back to back from different numbers).
Silencing it lets it ring out the full 4 times and they don’t know if the number still has a person on the other side. Also just using the default VM prompt rather than a custom one will help reduce the numbers.
Source: Annecdotal via tests over the years between a few friends and I.
One of them that is hard is waving your hand in front of your face. It trips up almost every deepfake system I’ve seen. That’s a common test we’ve had to start using with interviewees because they’d try to game the system.