You can do so using Lock Mode.
Press OK, Left navigation key followed by 5, 5.
Enter the four digit lock code.
Press the 1 digit key.
Select the lock mode range.
After selecting an option touch [OK].
For Device option the Lock option means the phone is always locked.
You can receive calls and make incoming calls.
The Unlock option means the phone is never locked.
The On Power Up option means the phone is locked when turned on.
In Location option you can set a lock mode setting.

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Press [OK].
Then press the Left Navigation key.
Press the “5” digit key twice.
Now enter the four digit lock code.
The last 4 digits of your mobile phone number are the lock code if it is set.
If it is not set the lock code is the last 4 digits of ESN DEC.

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