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The time zone is automatically obtained via the network, so if we change the network provider, the correct time zone is also automatically selected. If a different time zone is desired, the automatic time must be deactivated.

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  Additional settings
Step 3: Tap on  Date & time
Step 4: Turn Off  Set automatically
Step 5: Tap on  Time zone
Step 6: Set the  Time zone
  1. Tap on Settings
  2. Tap on Additional settings
  3. Tap on Date & time
  4. Turn Off Set automatically
  5. Tap on Time zone
  6. Set the Time zone
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Oppo Instructions