The screen may not light up immediately after a call ends in some cases. Such situations are also normal. For example, if you close your phone case during a call, use the speakerphone, or connect headphones, the screen may not light up immediately after the call ends.
This happens because the phone has entered sleep mode. You can simply press the power button to wake up the screen.
Only if your phone exhibits the following issues during calls may there be a potential problem:
•The screen goes black without being close to your face.
•The screen doesn't turn off when the phone is close to your face.
•The screen doesn't light up when you move it away from your face.
•Covering the top part of the phone with your hand doesn't turn off the screen, etc.
If your phone is experiencing one of these issues during calls, please try the following methods.