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Select Settings in the action bar.
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Select the mode you want: Enter offline mode or Leave offline mode.
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If you put your device on Flight Mode while it's in online mode, your device is automatically moved into offline mode. When you turn your Flight Mode off, your device will then automatically move back into online mode (back to its original state before Flight Mode).
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If you put your device on Flight Mode while it's in offline mode, it remains in offline mode while Flight Mode is on, and still remains in offline mode when Flight Mode is turned off.