Use a call blocking feature or a call blocking app on your smartphone to block incoming calls that you don’t want to receive. These calls are annoying, disruptive, and time-consuming. Call blocking apps do two things: identify who is calling, and block the call if the number is listed as unknown.

Here are some of the best apps to block unwanted calls. The suitability of these call blocking apps depends on your personal needs. Choose the one that suits you best.

Truecaller is a popular number lookup app with a number repository of over 2 billion records collected from users’ contact lists worldwide. It is good at identifying numbers, which makes it good at blocking calls from unknown sources.

Apps like Truecaller have access to your phonebook, which it adds to the huge database on its server. If you’re uncomfortable with that, this might not be the app for you.