This is a Call blocker app or an app that performs Calls screening.For now you can choose rules to four groups: 1-Hidden numbers 2-Strangers (not in contacts list) 3-Contacts (except favorites) 4-FavoritesThen you can refine by adding a contact from your phoneHas the particularity of let you choose how to block the call, you can:Allow - The call is not blockedSilence - The ringtone is silenced for the incoming call (Android 10+)Ignore - The call is blocked but the caller perceives as if the phone was ringing and no one answer.Reject - The call is blocked/disconnected as if the user had manually rejected it.Its a freemium version, without ads, you have some time to test with full functionality and inn-app purchases to remove the time constrain.Here some abilities that can be added:-block specific numbers-prefixes-use time ranges-groups from the contacts appEnjoy.