1. From Home screen, navigate to Setting -> Phone and SIM PIN.
2. Tap on the SIM PIN switch to turn on(in green) or turn off(dimmed)
3. Enter SIM PIN for verification. Most of the time, default password would be 0123 or 1234. I do suggest you to get in touch with your telco should you need confirmation else SIM card will be locked after 5 password failure attempts.
