Open your Android’s Settings. Tap Sounds and vibration. Tap Ringtone or Phone ringtone. [1] X Research source Depending on your Android, you’ll now have to tap + or My Sounds to view the custom ringtones you’ve added. [2] X Research source Select the ringtone you want to use.
If Viber opens to a conversation, tap the back arrow at the top-left to go back to your Chats list.
If you changed your Android’s ringtone to a custom sound, select Default ringtone to use that sound.