Xiaomi's mobile phone text message doesn't ring What is the reason?

Turn it off, press and hold the volume up+power on key to enter recovery mode, clear all data, and temporarily do not recover data after power on to see if the problem can be solved.

Whether to turn on the ringtone volume, press the phone side key to increase the phone volume.

Check whether the setting of SMS reminder sheet is correct, including information, menu, settings, universality and prompt tone, and check whether the prompt tone is set.

Check whether the Do Not Disturb function is turned on.

If not, it is recommended to make a backup first, and then restart the phone to restore the factory settings.