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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 your finger downwards starting from the top of the screen.
Press the settings icon.
Press Date & time.
2. Turn on automatic date and time update
Press Auto-date & time to turn on the function.
3. Turn on automatic time zone update
Press Auto-time zone to turn on the function.
4. Turn on manual time zone update
Press Auto-time zone to turn off the function.
Press Select time zone.
Press the required time zone.
5. Return to the home screen
Press the Home key to return to the home screen.