1. Play audio and turn up the volume. If there is no sound in the speaker, it may be that the speaker is damaged. Please go to the vivo customer service center to handle it.
2. Enter WeChat-Me-Settings-New Message Reminder-New Message System Notification-New Message Notification-Voice-Select the tone.
3. Enter Settings-Sound and Vibration/Sound Vibration and Silent Keys-Increase the notification volume and enter "do not disturb mode/Focus Mode"-Turn off the function; There is a mute button on the side. Please press the button to turn off the mute mode.
4. Enter Settings-Notification and Status Bar-Application Notification Management-WeChat-Allow Notification;
5. Enter Settings-Applications and Permissions-Permissions Management-Permissions-Self-Start-WeChat-Turn on the switch, and turn on WeChat at the same time, and pull down and lock it in the multitasking switching interface, keeping it running in the background;
6. Enter Settings-System Management/More Settings-Backup and Reset-Restore all settings; This operation will not delete files or software, but will cancel the password and restore all settings, including the set wallpaper, unlocking method, WiFi, default opening program, etc.
note:
Enter cloud service-device cloud backup-backup data type-system data-return-immediately back up some backup system settings and desktop layout;
Cloud service-data synchronization-turn on WLAN and Bluetooth to synchronize data to cloud service.
If the above methods are not improved, you can enter vivo official website-My-Online Customer Service-Enter labor and consult online customer service feedback.