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Tap on it to switch it on, wait for a little while, and then tap on the icon again to switch the mode off. Swipe up from the home screen, and you will see the Airplane Mode icon. It doesn’t have a direct link with fixing the iPhone apps not working on iOS 15 issues. Other than the simple restart, you can also consider turning the Airplane mode on or off. Drag the slider to switch off your device and turn it back on by pressing and holding the Top/Side button.