KeepCallsSafe

KeepCallsSafe is a small Android app that does one job well: calls with no caller ID – hidden, private, withheld or unknown numbers – are rejected before your phone even rings. No settings to search for and nothing to ask your network.

Optionally it can also reject calls from abroad that aren't in your contacts, while countries you choose (for example where your family lives) always get through. People saved in your contacts are never blocked, and any other number can be marked "always allow" with one tap. Blocked calls go to your voicemail if your network provides one, and every blocked call is listed in the app.

Privacy: every call is checked on the phone. No account, no ads, no tracking, nothing uploaded – Google Play lists the app as collecting no data.

Android 10 or newer, any brand. 60 days free, then a yearly subscription (Google Play shows the price for your country). Available in 134 countries and over 30 languages. Made by one developer in Ireland.