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