![Samsung Galaxy A51 5G](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-4184e4e6-af71-4107-ab7d-9714a2562cbc.png?width=150&height=320)
Samsung Galaxy A51 5G
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-b5b61328-b695-4dd6-98d1-52b8beca5fab.png?width=206&height=456)
Press the settings icon.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-c520e3a2-6d60-434e-8966-402426b1ec04.png?width=206&height=456)
Press Biometrics and security.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-d6cc713b-5747-4947-81ee-1e976109d0f6.png?width=206&height=456)
Press Other security settings.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-97e3c26d-f4d3-45aa-a6f2-488adbe790ab.png?width=206&height=456)
Press Set up SIM card lock.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-b8420aac-e540-41b2-8fa3-9d509794bdca.png?width=206&height=456)
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-d98bbb98-ac45-414e-9159-617de90bd4e8.png?width=206&height=456)
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-fd3dafdb-f821-46bd-9db4-0979eeb8c69b.png?width=206&height=456)
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-d98bbb98-ac45-414e-9159-617de90bd4e8.png?width=206&height=456)