People usually think -"what would happen even if their cell phones are on ?"(not on flight mode). People doubt that it would hardly crash as many people do not follow the on-board instructions. Let's see what the expert reports suggests:
There is no evidence that signals from passengers’ electronic devices have ever caused a plane to malfunction and crash. The reason for prospective safety concerns is due to the fact that when you are more than 10k feet in the air, your cell phone signal bounces off multiple towers and sends out a stronger signal. This is something that might congest the networks on the ground. But, there has never been a case of a cell phone causing a plane to crash.
Also, if you leave it on, it can annoy pilots and cause an unpleasant sound for air traffic controllers. A smartphone’s radio emissions can be very strong, up to 8W, which cause this noise due to parasitic demodulation. However, in a worst case scenario, repeated interference from mobiles could cause the crew to miss a crucial radio call from air traffic control.In a blog post for Airline Updates, a pilot said that transmitting mobiles can cause audible interference on an aircraft’s radios, but it is rare. He said: “Your phone will probably annoy a few pilots and air traffic controllers. But, most likely, not badly enough for them to take action against you if that’s what you want to know.”
“You may have heard that unpleasant noise from an audio system that occasionally happens when a mobile phone is nearby. I actually heard such noise on the radio while flying. It is not safety critical, but is annoying for sure.”
Those problems are something like the noise that can be heard when a smartphone rings near to a speaker: a slow, percussive thumping. But instead of coming out of a speaker it can be heard through the headsets that are worn by pilots.
Further, he also continues by saying that if 50 people on the plane did not turn their smartphone onto flight mode, it would cause a lot of “radio pollution.”
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