If you have an iPhone 6, there is a good chance that you have Sim Pin. If not, you can unlock Sim Pin by following these steps:

  1. Open the Settings app and tap on the General tab.
  2. Scroll down and find the Sim Lock section.
  3. Toggle on the Sim Lock switch and enter yourSim number into the text field.
  4. Tap on the Unlock button to finish unlocking Sim Pin on your iPhone 6.