A great improvement to that would be an option to silently reject all suspected spam calls and send them to the voicemail. This has been suggested many times on

A great improvement to that would be an option to silently reject all suspected spam calls and send them to the voicemail. This has been suggested many times on Google's product feedback and suggestion boards but for some reason they have not gotten around to doing it. The hard part of detecting spam calls is already there; all it should take is adding a couple of new check boxes.