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It's important that the date and time are correct as some phone functions won't work.
Slide two fingers downwards starting from the top of the screen.
Press the settings icon.
Press System.
Press Date & time.
Press Use network-provided time.
Press Use network-provided time to turn on the function.
Press the indicator next to 'Automatic time zone' to turn on the function.
Press the Home key to return to the home screen.