Hiya Caller id & block Free
One benefit of the CallKit API in iOS 10 is that third-party apps can identify or block unwanted calls, so that you don’t waste even seconds on answering them. This app’s information about callers is crowdsourced, so you give a helping hand to others, too.
Why you need it: Forewarning about scam or spam calls.
What’s it best for: The ability to block those calls altogether.