![Samsung Galaxy A21s](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-bb012320-6a9f-40ba-a3de-77ccaf7d7d42.png?width=150&height=320)
Samsung Galaxy A21s
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-b9c8b03a-d135-4442-a454-47ec9b04fe4b.png?width=200&height=448)
Press the settings icon.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-1b5f071f-b0d5-4458-9d57-1d5ca8b427dc.png?width=200&height=448)
Press Biometrics and security.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-42343e0e-5fa8-4b32-82cf-9a384ec757a8.png?width=200&height=448)
Press Other security settings.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-c64012e9-cd56-4203-bd52-41f9f6c6d989.png?width=200&height=448)
Press Set up SIM card lock.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-a93dd995-3965-44f0-b0a7-6b917514bf83.png?width=200&height=448)
2. Turn use of PIN on or off
Press the indicator next to "Lock SIM card" to turn the function on or off.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-d6d87fba-7fac-41cf-b91d-b0959be27d5b.png?width=200&height=448)
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-b19bb809-74a1-47db-855d-1abc14df255a.png?width=200&height=448)
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-d6d87fba-7fac-41cf-b91d-b0959be27d5b.png?width=200&height=448)