Chống làm phiền is an Android application developed by VIETTEL TELECOM, falling under the Personalization category. The app is free and allows users to block unwanted calls and messages from unknown numbers. It comes with three primary functions: blocking calls/messages from unknown numbers, blocking calls/messages from user-registered numbers, and setting up active blocking hours.

This application is an excellent solution for users who want to manage their calls and messages actively. However, it is only available for Viettel subscribers and not for users of other carriers. With its user-friendly interface, Chống làm phiền is easy to use and navigate, providing a seamless experience for users.