Why doesn't the POCO F7 Ultra screen turn off during calls?

Thank you for your support. The POCO F7 Ultra has undergone strict professional inspection before leaving the factory, so you can feel free about the performance and reliability of your device, knowing that it has been thoroughly tested for quality and functionality.
If the screen does not turn off when you put your ear to the phone, it can be caused by hair interference. When you make a call, you can try to lift your hair and put the phone close to your skin.