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HTC One M9
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Activate or deactivate flight mode
You can deactivate all wireless connections, so your mobile phone can’t cause any interference with sensitive equipment in a plane or a hospital. You can still use your mobile phone when flight mode is activated, but you can’t send messages or make calls.
1. Activate or deactivate flight mode
Press and hold On/Off.
Press Airplane mode to activate or deactivate the function.