What does Airplane Mode do?

We all know you're supposed to toggle on Airplane Mode when you get on a flight. But what does Airplane Mode actually do? In short, turning on Airplane Mode, shuts off cellular connectivity which grants access to voice and data uses like GPS, calls, and messaging. The Federal Aviation Administration (FAA) bans cellular connectivity on flights because "its signals could interfere with critical aircraft instruments." SEE ALSO:How to track flights on iPhone
Nowadays, many planes are equipped with W