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Published 14:55 11 Apr 2016 BST

According to The Daily Mail, if you don't it may annoy the pilot and air traffic controllers with an unpleasant sound.
It's been likened to the sound of a mobile phone coming into contact with speakers and is caused by the powerful radio emissions in the phone. We've all heard that sounds before,'dit-dit-dit-dit'.
That sound can ring through the pilots headphones and make it more difficult for them to hear instructions from the air traffic controller.Explore more on these topics:

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