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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 the indicator next to "Automatic date & time" to turn on the function.
3. Turn on automatic time zone update
Press the indicator next to "Use network-provided time zone" to turn on the function.
4. Return to the home screen
Press the Home key to return to the home screen.