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1.
Press Home key > tap > Settings > Security > Set up SIM card
lock.
2.
Make sure you already tick the Lock SIM card check box.
3.
Tap Change SIM PIN.
Setting up Credential Storage
This lets you select applications to access secure certificates and other
credentials.
Deleting Secure Credentials
1.
Press Home Key > tap > Settings > Security.
2.
Tap Clear credentials to clear credentials.