After the preset alarm clock of the system arrives, no ring is played.
1. Check whether the alarm clock is invalid because the battery level is too low. Ensure that the battery level of the mobile phone is sufficient.
2. Verify that the alarm clock volume is not too low. Click Settings-Sound to turn up the alarm volume.
3. Confirm whether to enable the alarm ringing function in mute mode. Turn on Clock-Settings, and turn on the sound of alarm ringing in mute or vibration mode to the maximum.
4. Verify that the non-spoofing function is enabled. Click Settings-Sound-Do Not Disturb to turn off the non-interference switch or click the non-interference mode only for the alarm clock (turn on the alarm clock switch during the tone and vibration).
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