Call Filter is a free Android app developed by Callfilter.app that provides a simple and effective solution to block unwanted calls. This app doesn't collect or transfer personal data and contacts and is completely ad-free.

The app automatically blocks various types of incoming calls, including advertising and intrusive services, calls from scammers, debt collectors, and intrusive offers from banks. It also blocks surveys, instantly dropped calls, and any other unwanted calls. The app also allows you to blacklist specific numbers, and wildcards are supported.

Call Filter doesn't require access to your contacts, unlike other blocker apps. It's easy to use and stable in operation. The app's blocked numbers database is updated several times a day, and your phone chooses the refresh rate based on the state of your battery and internet connection speed. The app is designed to update the blocked numbers database as often as possible, without draining your battery or slowing down your internet access.