What if there is no sound in Samsung's SMS?

According to your description, I suggest you: 1, turn on the phone settings-volume-media/ringtone/notification/system-resize for observation and use. 2. If the volume of the mobile phone automatically decreases or becomes silent after adjustment, please back up the data and try to restore the factory settings. If the problem still exists, it is recommended that you take the purchase invoice, maintenance card and mobile phone to the local Samsung service center for professional engineers to help you test. Please click on.