1. Enter the phone settings.
2. Locate the item "Application Management" or "Application Management" and click Enter.
3. Find "paper airplane" or "paper airplane application" in the application list.
4. Find "Notification Management" or "Notification Settings" and click Enter.
5. Under the "Notification Method" option, select "Prompt tone" or "Vibration".
After completing the above steps, exit and return to the application, and the paper plane will sound a prompt. If you still can't solve the problem of paper airplane prompt sound after following the above steps, it is recommended to contact vivo after-sales maintenance or consult vivo official customer service for help.