To enable the Airplane mode via action center, swipe down from the top of the screen and tap the airplane-mode icon. To disable it, repeat the same steps.
Note: Not all devices running Windows Phone have the action center available. If you can't access it, you can enable or disable the airplane mode via Settings (check the other solution to learn how).
To enable the Airplane mode (or Flight mode), go to Settings (swipe left to access the apps list) -> Select Flight mode -> Move the slider to the right
Note: To disable the Airplane mode (Flight mode), repeat the above-mentioned procedure and move the slider to the left.
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