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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 Additional Settings.
Press Date & Time.
2. Turn on automatic date, time and time zone update
Press the indicator next to "Use network-provided time" to turn on the function.
3. Return to the home screen
Press the Home key to return to the home screen.