Receiving calls from unknown callers can be quite frustrating and disruptive. Fortunately, Call Blocker: Caller ID & Block can help you with that. The app uses the world's largest phone number database of identified spammers and telemarketers, and the app automatically blocks calls from these unwanted numbers. You can blacklist any number you want.

Another useful feature of the app is the Do Not Disturb function, which allows you to set up a schedule during which you are unavailable to receive calls. This feature is particularly helpful when you are in meetings, attending formal events, or simply too busy to take calls.