Recently I’ve been receiving more and more spam phone calls. With iOS 10 Apple allowed developers to create extensions that would interface with the Phone.app and allow incoming calls to be checked against a database of suspected spammers.
Out of desperation, I’ve tried a few of these Apps claiming to screen or block suspected spam callers as they’ve popped up in the App store. Thus far the only one I’ve found that has worked somewhat reliably is Hiya. (Glenn Fleishman writing for Macworld has a more extensive review)