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OPPO A57 4G
Android 12.0
1. Find "SIM card lock"
Slide two fingers downwards starting from the top of the screen.
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Press the settings icon.
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Press Password & security.
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Press System security.
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Press SIM card lock.
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2. Change PIN
Press the required SIM.
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Press Change SIM PIN.
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Key in your current PIN and press the confirm icon.
If an incorrect PIN is entered three times in a row, your SIM will be blocked. To unblock your SIM, you'll need to key in your PUK. You can get the PUK by calling customer services on 191 from a Vodafone mobile phone. If you're using a land line, you need to dial 03333 040 191. Please note: If you key in the wrong PUK ten times in a row, your SIM will be blocked permanently. In this case, you need a new SIM from Vodafone.
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Key in a new four-digit PIN and press the confirm icon.
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Key in the new PIN again and press the confirm icon.
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3. Return to the home screen
Press the Home key to return to the home screen.
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