Here's the real reason smartphones need to be on Airplane Mode
Briefly

A pilot, who goes by @perchpoint, revealed that smartphones interfere with their headsets when they aren't placed on Airplane Mode and can pose a distraction when they’re trying to communicate with ground control.
PerchPoint did note that the plane wouldn’t experience severe repercussions for not turning on Airplane Mode and hasn’t been linked to any crashes.
Phones not on airplane mode and interfering with radios is something that happens under the right circumstances... it depends on things like the phone provider, location of the plane, the phone actively trying to make or receive a phone call, and where the passenger is sitting.
He explained that the Airplane Mode feature 'is not a conspiracy' and there is a good reason why you're asked to switch off before the plane takes off.
Read at Mail Online
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