Other iPhone modes: Press and hold the power button (sleep/wake) until you see the power-off slider.
Then press and hold the side button until you see the Apple logo. Wait 30 seconds for your iPhone to turn off.
iPhone X, 11, 12, 13, or later: Press and hold the side button and the volume down (or up) button together until you see the “slide to power off” screen appear.
Restarting your iPhone may fix your Airplane Mode. When you put your phone in Airplane Mode, the wireless features (Bluetooth, Wi-Fi, GPS, or cellular) are disabled. When it is off, the icon should disappear.
You can also easily turn it off at any time.
The Airplane Mode icon will appear when it is turned.