Your SIM card is locked with a PIN (personal identification number) so that an identification code is required for phone calls and the use of mobile data. This prevents other people from using your SIM card to make calls or use the mobile data connection.

You can change this PIN, which is set by your network operator.

1. Open the Settings

2. Security & location

3. SIM card lock

4. Change SIM PIN

5. Enter old PIN

6. Enter new PIN 2x