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The PIN2 is used to limit the use of your SIM. The PIN2 enables you to decide which phone numbers can be called or how much your SIM can be used. Incoming calls aren't affected. Follow these instructions to change the PIN2.
Find "Change PIN2"
Press All apps to access the main menu.
Press Fixed Dialling Numbers.
Press Change PIN2.
Key in your current PIN2 (default is 1111) and press OK.
Key in a new four-digit PIN2 and press OK.
Key in the new PIN2 again and press OK.
Press the Home key to return to standby mode.