If you rather have the SIM-PIN notification turned off when you start up you phone after it being turned off follow these steps:

  1. Open Settings
  2. Go to Phone
  3. Scroll down to SIM PIN
  4. Uncheck the Green tickbar
  5. Enter your SIM PIN one last time
  6. You should now not receive any notifications about SIM PINS when restarting your phone!

Hope this helps.