You can protect your SIM card from unauthorized use by assigning a PIN (personal
identification number). Emergency calls can be placed at any time, without requiring a
Make sure you have the default SIM PIN provided by your mobile operator before
From the Home screen, press MENU,
and then tap Settings.
Scroll down the screen, and then tap
Select the Lock SIM card check box.
Enter the default SIM card PIN, and then tap OK.
To change the SIM card PIN, tap Change SIM PIN.