Your iPhone with iOS 13 Can Stop Spammers & Unknown Callers from Ringing your phone and send them Directly to Voicemail!
To activate this fantastic enhancement:
1. Go to Settings:
3. Scroll down to: Silence Unknown Callers
4. Tap to Select, (turn the button green)
Then relax, knowing that unknown numbers will not ring your phone, rather they will be sent directly to Voicemail! Typically only valid callers will leave you a message. Do put all your important contacts in your phone, so they can call and ring your phone, otherwise they will end up going directly to voice mail as well!
Thank you Apple!