The Federal Communications Commission (FCC) banned in-flight use of most cell phones and wireless devices in 1991, citing the reason of ground network interference. FAA regulations uphold the FCC decision. But some airlines allow passengers to use cell phones in "airplane mode," which shuts off phone transmissions.
Also know, why do you have to put your phone in airplane mode?
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. A phone's radio emissions can be very strong, up to 8W; they cause this noise due to parasitic demodulation. I actually heard such noise on the radio while flying.
What happens when your phone is in airplane mode?
Airplane mode is a setting on cell phones, smartphones and other mobile devices that prevents the device from sending or receiving calls and text messages. Airplane mode is also known as offline mode, standalone mode and flight mode.
What is the function of airplane mode?
Airplane mode, airoplane mode, flight mode, offline mode, or standalone mode is a setting available on many smartphones, portable computers, and other electronic devices that, when activated, suspends radio-frequency signal transmission by the device, thereby disabling Bluetooth, telephony, and Wi-Fi.