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It's important that the date and time are correct as some phone functions won't work.
1. Find "Date and time"
Slide two fingers downwards starting from the top of the screen.
Press the settings icon.
Press Date and time.
2. Turn on automatic date and time update
Press the indicator next to "Set time automatically" to turn on the function.
3. Turn on automatic time zone update
Press the indicator next to "Set time zone automatically" to turn on the function.
4. Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.