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OPPO A57 4G
Android 12.0
1. Find "Call forwarding"
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 forwarding.
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2. Divert calls to voicemail
Press the required SIM.
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Press the indicator next to the required divert type.
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Key in +447836121121 and press the confirm icon.
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+447836121121
3. Return to the home screen
Press the Home key to return to the home screen.
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