Why does the SMS prompt sound of Samsung mobile phone keep ringing?

Because the system detected an unread notification.

Other mobile phones can also be found in the settings in a similar way, and the names will not be much different. First, open the settings.

2. Switch to the device tab of the setting interface.

3. Find the "accessibility" and "vision" on the right. Yes, you are not mistaken. Not "listening" or "seeing". Click to enter.

4. There is a "notification reminder" to close.