Like everyone else, I am inundated with Robo calls, spam calls, scam calls, etc., but I have found some small relief! I discovered a feature on my 8 Plus that allows me to have all unknown numbers go straight to voicemail so I never have to even hear the phone ring! I may not be able to prevent these calls from coming in, but at least I do not have to bothered with them ringing in! Phew! What a relief! Thank you APPLE!! Wanted to mention this for anyone else who may not know about this feature.