If you don't put your phone on airplane mode during a flight, your phone will probably annoy a few pilots and air traffic controllers. That is what we most likely think but actually you may have every heard that unpleasant noise from an audio system, that occasionally happens when a mobile phone is nearby." Pilots are hearing the same thing so they want us to know that we might disrupt air travic controllers but that is not true. They just hear the same annoying sound.