If your Redmi 9 screen turns off unexpectedly during calls, or if the display stays black and doesn’t turn back on when you move the phone away from your ear, this is likely due to the proximity sensor. Here’s a step-by-step guide to fix the issue:
Open the Settings App
Scroll Down and Tap on "Apps"
Select "System App Settings"
Go to "Call Settings"
Choose "Incoming Call Settings"
Disable "Proximity Sensor"
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