What is iPhone airplane mode?
Airplane mode ensures your iPhone complies with airline regulations by shutting off all wireless signals from the device when boarding a plane to prevent interference.
To turn on airplane mode, navigate to Settings -> Airplane Mode -> ON. This will prevent cellular phone calls and data, Wi-Fi, GPS and Bluetooth signals from being emitted from your iPhone. When activated, an airplane icon appears in the status bar of your iPhone home screen.
If needed, you can switch on Wi-Fi while in airplane mode. Bluetooth can also be switched on while in airplane mode, leaving the GPS and cellular radios off.