İphone 8 plus call sensor
iPhone 8 plus turns off by showing red lines on the right of the screen while the sensor that allows the phone to turn off the screen in calls
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Hello,
See this:
"The sensor is small, and dust accumulated over time might be one of the reasons for the proximity sensor malfunction. Use a clean cloth, preferably a microfiber cloth, and clean the display, especially near the front camera area, where the proximity sensor lies."
Also see:
Get help with the display on your iPhone, iPad, or iPod touch
Good luck.