Why the sensor works always

Why the sensor of the iPhone XS Max works always without I put it on my ears

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Meryem, I suspect I'm not alone when I say that I don't understand your question. Which sensor are you talking about? Do you mean the proximity sensor? Is the screen being turned off constantly and not just when you hold the phone to your ear? If that's the case, how do you know it's the proximity sensor?

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