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OPPO A77 5G
Android 12.0
1 Find "Fixed dialling numbers"
Press the call 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 Fixed dialling numbers.
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2 Turn on fixed dialling
Press Enable FDN.
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Key in the PIN2 and press the confirm icon.
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3 Turn off fixed dialling
Press Disable FDN.
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Key in the PIN2 and press the confirm icon.
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4 Return to the home screen
Press the Home key to return to the home screen.
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