If you would like to set up a lock screen on your phone, start from the next step. If you would like to change the SIM pin code, jump to step 13. Make sure you have your Public SIM PIN before you start the guide. NOTICE: SCREEN IMAGES MAY DIFFER FROM YOUR ACTUAL DEVICE.
Answer
Old SIM PIN
New SIM PIN
Your SIM PIN has been changed.
Confirm new SIM PIN