A free app for Android, by Dingtone Communications Ltd.

Robocall Blocker: Spam Filter is an application that will block calls that look like they may be fraudulent. This is useful if you get lots of spam calls all of a sudden. This can also help you identify any scam attempts. It is very easy to use and will work with your Android phone.

The application is very easy to use. First, you need to download and install the app. After that, you will be able to set up the blocking mode. You can also add phone numbers and caller ID names to your block list. The app also features an automated response service that will help you get revenge on those unwanted callers.