If your SIM card came with a default PIN code, you can change it to something more secure.

  1. On the start screen, swipe left, and tap settings iconSettings.
  2. Swipe to applications.
  3. Tap phone, switch SIM security to Ontoggle on icon, and type in your PIN code.
  4. Tap change SIM PIN.

The PIN code can be 4-8 digits.