![OPPO A57 4G](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-ccc1f389-7e5c-4ef2-86b2-dac3129e8544.png?width=150&height=320)
OPPO A57 4G
Android 12.0
1. Find "SIM card lock"
Slide two fingers downwards starting from the top of the screen.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-9a7d7d49-1709-4d0b-a490-fcda21ff950e.png?width=200&height=446)
Press the settings icon.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-9b5b36bf-abf1-4288-9ddc-88a494d4fae2.png?width=200&height=446)
Press Password & security.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-c0d637ec-c49c-4ce4-87f1-26801312764c.png?width=200&height=446)
Press System security.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-1175abc3-4bfe-4048-afe3-bb9c6779a13e.png?width=200&height=446)
Press SIM card lock.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-77d7bb88-9a51-41b1-bf4b-416823fa1637.png?width=200&height=446)
2. Turn use of PIN on or off
Press the required SIM.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-606a9522-1094-42c4-8335-fd87186cf923.png?width=200&height=446)
Press the indicator next to "Lock SIM Card" to turn the function on or off.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-9ac40743-3102-4624-856a-21a0302e8acb.png?width=200&height=446)
Key in your 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.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-242a3cbc-5e5c-447e-96cd-36a588a51aec.png?width=200&height=446)
3. Return to the home screen
Press the Home key to return to the home screen.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-9ac40743-3102-4624-856a-21a0302e8acb.png?width=200&height=446)