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