Why does my cell phone light up when I get near it on the bed and not when It is right side down?

If your screen is side down, how do you know it doesn’t light up?

@chyna I checked it out in the dark. Yes, I have lots of free time.

Some phones are programed to stay dark when they are face down.

There’s a sensor on the front that detect when your near it so it lights up ready for you to touch the screen. The same sensor switches the screen off when you hold it to your ear so you don’t accidentally push something while on a call.