Your PIN protects your SIM from unauthorised use if your mobile phone should get stolen. You can change your PIN to a PIN of your own choice making it easier to remember. Before you can change your PIN, you need to turn on use of PIN.
Slide your finger downwards starting from the top of the screen.
Tap the settings icon.
Tap Lock screen and security.
Tap Other security settings.
Tap Set up SIM card lock.
Tap Change SIM card PIN.
Key in your current PIN and tap OK. The default PIN is 0000.