After download and install, launch the Avast Mobile Security & Antivirus app from app launcher and Scan this device screen will appear. Now tap on top right “Tools” icon to get Call blocker option.Must See: 5 Best free Call-Blocker-apps for Android Smartphone. In case it is already installed follow the steps below to block Unknown Numbers, Hidden numbers or any particular caller number. If you don’t have installed Avast Mobile Security & Antivirus app yet. Then it can be easily installed via Google Play Store. Block Calls using Avast Call Blocker option:
