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Why does the Redmi 13C not turn off the screen during a call?

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Why does the Redmi 13C not turn off the screen during a call?

The reasons for the Redmi 13C not turning on or off the screen during a call are listed below:
1. The screen on/off function during a call detects the distance between the face and the screen. If the distance of the ear touching the screen is too small or the angle is too large during the call, it will be detected that the face does not get close to the screen, resulting in the screen not being turned off;
2. The upper part of the phone screen should maintain a large area of touching the face or ears, and the angle between the screen and the face should not be too large;
3. During extended calls on the Redmi 13C, the screen automatically turns off for power saving. Simply pressing the power button to wake it up. If the screen remains dark, ensure you haven't accidentally pressed the power button.