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OPPO A57 4G
Android 12.0
1 Find "Call barring"
Press the phone icon.
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Press the menu icon.
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Press Settings.
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Press Calling accounts.
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Press Advanced settings.
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Press Call barring.
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2 Turn call barring on or off
Press the required SIM.
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Press the indicator next to the required barring type to turn the function on or off.
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Key in your barring password. The default barring password is 1919.
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1919
3 Return to the home screen
Press the Home key to return to the home screen.
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