Answer is nothing !!!
Nothing terrible is going to happen at once !!!
People are afraid that if the mobile phone remains switched ON, there would be some emergency for the aircraft.
NO NEED TO FEAR !!!
Aircrafts these days are built with such advanced technology as to ensure aircrafts are resistant to any form of consumer electronics devices' interference.
But it does not make airplane mode, pointless !!!
When airplane mode is activated, mobile's cellular radio is turned off preventing the device from connecting to ground based cell towers.
Then, phone may continue to establish connection while the aircraft is taking off, in flight or landing.
This can lead to,
1. Increased battery usage.
2. Limited connectivity
3. Interference or additional noise
When airplane mode is activated, many airlines allow passengers to turn WiFi and Bluetooth back on separately.
Always follow the airlines onboard device rules.
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