With priority caller you can simply add in numbers in your "Whitelist" from whom you want to receive calls. All other calls get blocked.

Prominent features include:
- A clean and easy to use UI
- The ability to set duration in which Priority Caller is run
- View logs of numbers that were blocked during a session.

Priority caller makes it easy to block unnecessary numbers, as it allows you to take calls from numbers in your 'Priority' only.

So download the best call blocker based of a whitelist with the best design you can find on a call blocker app.