Question

Which rays are emitted by the camera of the phone when it is switched off?

Answer 1

First, cell phone radiation is in the form of radio waves. There are many other topics on quora where you can find out that there is no reason to be afraid of radio waves.

Then: the radio waves used for cell phone communication come from 2 sides: the phone sends to the tower and the tower sends to the phone, and any other phone in the surroundings. The radio waves will be there always as long as there are other phones or cell phone towers in the surroundings.

If you have your phone switched on in your hand or pocket, those will be the strongest signals because they are generated closest to you, so if you switch it off you will reduce the intensity of the radio waves in your environment. But the benefit of carrying these units is also quite limited if everybody would switch them off. And repeating my first statement: there is no reason to do so if you're looking for health benefits.