A free app for Android, by Bluestar Technologies.

Block unwanted calls with this app for Android. It has an advanced blocking system with a blacklist and a whitelist. It can block any phone number, even if it is not in your contacts list. It is easy to use and can protect your phone immediately.

The app has a simple and friendly interface. You can choose to block calls from a number in your contacts list or add it manually from the app. You will be shown detailed information about any call you receive and will be able to use the call-blocking function to block the number and protect your phone immediately.

This app is very easy and lightweight, yet it has powerful call-blocking capabilities.