![Samsung Galaxy S21 Ultra 5G](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-ee679143-c863-46d6-9a64-f2457162c911.png?width=150&height=320)
Samsung Galaxy S21 Ultra 5G
Android 11.0
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-b046ae34-0c83-43a5-a7fe-d4a9539ce1cc.png?width=210&height=466)
Press the settings icon.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-3ac35714-e62f-4d66-837a-4ea3e6c9326f.png?width=210&height=466)
Press Biometrics and security.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-712456b9-cc9e-431b-bbc2-2f56732b6530.png?width=210&height=466)
Press Other security settings.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-f47881f5-4049-44cc-b3b5-23b000f94587.png?width=210&height=466)
Press Set up SIM card lock.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-b94898c9-302d-487c-88b9-3df4fc52baba.png?width=210&height=466)
2. Turn use of PIN on or off
Press the required SIM.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-6a02d6a6-4405-415f-b238-c42c13c74040.png?width=210&height=466)
Press the indicator next to "Lock SIM card" to turn the function on or off.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-6a02d6a6-4405-415f-b238-c42c13c74040.png?width=210&height=466)
Key in your 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-6ff1236d-5267-4393-81a3-ee36edc68ac3.png?width=210&height=466)
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-6a02d6a6-4405-415f-b238-c42c13c74040.png?width=210&height=466)