Rakuten Viber Messenger is a communication app enabling free messaging and calling with features like group chats and end-to-end encryption.

Download Rakuten Viber Messenger from Google Play Store or Apple App Store and follow installation instructions.

Upon first opening, register with your phone number, set preferences, and start adding contacts.

Key features include free messaging, video calls, end-to-end encryption, and group chats with up to 250 members.

Customize experience by adjusting notification settings, chat backgrounds, and privacy preferences in settings menu.

Save favorite content by forwarding messages to yourself or using the built-in note-taking feature.

Share content easily by tapping the share button and selecting desired contacts or social media platforms.

Access detailed information through help center or explore more content via Communities and Channels feature.

The app requires permissions for microphone, camera, and contacts access; manage these in device settings.

Check for updates in app store or enable auto-updates to ensure smooth performance and latest features.