NumBuster is a free app that helps manage incoming calls from unfamiliar phone numbers that are not in your contacts or phonebook. With this app, you can anonymously see how a telephone number is stored or called by other people. You can also send a request to any NumBuster User in your contacts to find your mutual acquaintances. The app requires permissions for caller ID, spam detection and blocking, SMS management, and call screen and default dialer application. With these permissions, you can check calls and SMS for their ratings and tags, block them, and use NumBuster as your default SMS and caller app.

The app has a community of over 2 million users and offers automatic phone number lookup with built-in caller ID feature before you answer the call. It also provides the definition of service provider, carrier, and possible location of the caller. You can block incoming calls, use the free social blacklist for spam calls, and get automatic protection against fraud, advertising, calls from debt collectors, car dealers, salesmen, and criminals. The social blacklist is constantly updated with new features, guided by the opinion of real people about various phone numbers.

NumBuster constantly learns and verifies the numbers used by banks, stores, auto dealers, insurance companies, and debt collectors. With the free social caller ID in calls and SMS, you can find out whose phone number calls and whom it belongs to. You can always block unwanted calls and protect yourself from debt collectors. The app has been recognized as the application of the year 2015 by PC Magazine.

It is important to note that your phone number will still be available only to the person to whom you call yourself, and no one can get your phone number from NumBuster using search by name. An internet connection is required for caller ID.