![Samsung Galaxy A51](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-b4bf2131-9672-4038-b87c-726bcc08be37.png?width=150&height=320)
Samsung Galaxy A51
Android 10.0
1. Find "Set up SIM card lock"
Slide two fingers downwards starting from the top of the screen.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-ba8fe847-7002-4336-9120-a2616927c3ca.png?width=204&height=454)
Press the settings icon.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-c1d3dfac-a61d-4197-84ae-44d0ed1a1757.png?width=204&height=454)
Press Biometrics and security.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-5ca7f918-cf74-42cc-8528-2bc3741a7567.png?width=204&height=454)
Press Other security settings.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-ef3d87e8-b981-4dca-9b40-b52baed010d8.png?width=204&height=454)
Press Set up SIM card lock.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-8c67a1a9-44c9-4d39-bdfa-87d0469fd3e7.png?width=204&height=454)
2. Change PIN
Press the required SIM.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-f0cb3491-0128-4583-99eb-265e4198868f.png?width=204&height=454)
Press Change SIM card PIN.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-f0cb3491-0128-4583-99eb-265e4198868f.png?width=204&height=454)
Key in your current PIN and press OK.
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-239fba5f-11bd-47bd-9f66-26cef0baaeca.png?width=204&height=454)
Key in a new four-digit PIN and press OK.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-9ab7dfdf-e5bc-4200-beb4-2740ce19e7c4.png?width=204&height=454)
Key in the new PIN again and press OK.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-12dbb763-c595-4e9d-aefc-658d9afa96ac.png?width=204&height=454)
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-f0cb3491-0128-4583-99eb-265e4198868f.png?width=204&height=454)