1. It may be caused by setting the option of turning off all sounds. It is suggested that you turn off all sounds and uncheck the box through mobile phone settings-(My device/device)-auxiliary functions-(Listening).

2. set-sound-volume, and try to turn up the volume.

3. if it is invalid, please back up the data (contacts, multimedia files, etc.) in the mobile phone and restore the mobile phone to the factory settings.

if the problem still exists, please bring the purchase invoice, the repair card and the machine to the Samsung service center for inspection by the engineer.