What is airplane mode on a cell phone, and why is it required when flying?

Cell Phone Settings on Board, Domestic Flights

Flight mode phone hi-res stock photography and images - Alamy

How Flight Mode Helps Reduce Exposure To EMF Radiation

What Happens When You Don't Turn on Airplane Mode on a Plane

You could be charged hundreds of pounds if you don't put your phone on airplane mode during a flight – The Sun

Choose iPhone settings for travel - Apple Support

What Is Airplane Mode on Your Phone and How to Enable or Disable It - Guiding Tech

9 Reasons to Use Airplane Mode Even If You're Not Traveling - Nimbus Blue

What Does Airplane Mode Do, and Why Do You Need to Use It? - AFAR

CNA Explains: Should you switch off your phone while on a flight? - CNA