That's a simple phone CAPTCHA that can stop robocalls, but human spammers can easily bypass it, so you likely don't get such calls. I think just sending all ca

That's a simple phone CAPTCHA that can stop robocalls, but human spammers can easily bypass it, so you likely don't get such calls. I think just sending all calls to voicemail and urging callers to leave a message if it's important should stop all spam. No human spammer will want you to call them back, and most of their numbers are spoofed, so you couldn't anyway.