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To set the PIN lock, do as follows: 
1.  Press   (Menu) and select Settings > Security > PIN Lock. 
2.  Enter the correct PIN and press   (OK). 
3.  Select On/Off to enable/disable the PIN lock. 
Changing the PIN Code 
If your PIN is locked, you can change your PIN by entering the correct PUK. If 
you enter wrong PUKs for 10 times, the UIM card becomes invalid 
permanently. Contact the service provider for a new card. 
1.  Enter the correct PUK code and press   (OK). 
2.  Enter a new PIN and press   (OK). 
3.  Re-enter the PIN and press   (OK).