This article explains how to use Airplane Mode to turn off all network communications on your phone so that it no longer interferes with the aircraft's instrument panels.

Airplane mode on a mobile phone disables all network communications, including cellular, Wi-Fi, and Bluetooth. On some phones, it even disables the phone's GPS function.

Originally, Airplane Mode was intended to be used while flying, so you could keep your phone on but turn off any wireless communications signals that could interfere with the plane’s instrument panel. However, most planes now have Wi-Fi available, and many may soon have cellular access, so what’s the point of using Airplane Mode these days?

Because Airplane Mode turns off wireless communication signals, it also has some additional benefits. Because Airplane Mode turns off hardware signals, it can also extend your battery life. Some of the features that Airplane Mode turns off include: