I don't take calls but I do always USE TRUCALLER that is the very best app they do block any spam calls anytime so I do recommend it and its free. Besides the Rating stands and I am not changing the rating as Trucaller does more than just Block as they update with new numbers to block so any spam calls will be blocked automatically. Also TrueCaller is totally Ad free without you having to part with your brass to get it Ad Free. Give it a Go guys!