Changing Your SIM PIN
You can change the PIN you’ve been given to one easier for you to remember and harder for others to guess.
1.Touch Home Key > 
> Settings > Location & security > Set up SIM card lock.
2.Make sure you already tick the Lock SIM card check box.
3.Touch Change SIM PIN.
4.Enter the old PIN and touch OK.
5.Enter your new PIN and touch OK.
6.Enter the new PIN again and touch OK.
Restoring a Locked SIM Card
Put all your confidential passwords in a safe place for future use. If you enter the wrong SIM PIN more times than allowed, your SIM card will be locked and you cannot access the mobile phone network. Contact your operator for a PIN Unlock Key (PUK) to restore the SIM card.
Setting Up Credential Storage
This lets you select applications to access secure certificates and other credentials.
Enabling Secure Credentials
1.Touch Home Key > 
> Settings > Location & security.
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