Can I turn on my cell phone after the plane takes off?

Any radio communication equipment needs to occupy certain spectrum resources for communication. If there are other radio signals in this spectrum, they will interfere with each other and make the judgment of the received signal wrong.

For civil aviation, absolute safety is required, which means that radio communication is absolutely correct and reliable, so no interference is allowed in the radio navigation frequency band.

Extended data:

EASA said that civil airliners can turn on electronic devices such as mobile phones during flight, but airlines still need to make their own evaluation to confirm that the aircraft system will not be affected by the signals of portable electronic devices, and then formulate their own implementation guidelines, which means that the implementation of this new regulation in some airlines may be delayed.

Previously, EASA stipulated that passengers must adjust their mobile phones to flight mode during flight.

References:

The maximum penalty for playing a mobile phone after the plane takes off is 50,000 _ Sina News