Why doesn’t the Xiaomi 15 screen turn off when making calls or using voice features in third-party APPs?

For people with darker and denser hair, the phone’s proximity sensor has difficulty detecting the screen’s position during calls or third-party APP voice calls, preventing the screen from turning off.
If this feels inconvenient, try lifting the hair away and bringing the phone closer to the skin to ensure proper detection. Additionally, if the screen does not turn off when answering a call quickly, try slowing down the movement of bringing the phone to your ear (half a second or more) and adjusting the hair before answering. Keeping the sensor area clean can also help prevent detection issues. These steps can improve the screen-off experience during calls, making usage more convenient.