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16. Reference 
Information
Access Codes
You can use the access codes described in this section to avoid 
unauthorised use of your phone and SIM card.
The access codes (except PUK and PUK2 codes) can be changed by 
using Menu 4-5-6. See the following section.
Security Code (5 digits)
The security code can be used to avoid unauthorised use of your 
phone. The security code (security code) is usually supplied 
with the phone. Change the security code before you start using 
your phone. Keep the new code secret and safe place which is 
separate from the phone.
PIN Code (4 to 8 digits)
The PIN (Personal Identification Number) code protects your SIM 
card against unauthorised use. The PIN code is usually supplied with 
the SIM card. When the PIN code request is enabled (Menu 4-5-1), 
the code is asked each time the phone is switched on.
PIN2 Code (4 to 8 digits)
The PIN2 code, supplied with some SIM cards, is required to access 
some functions, such as charging unit counters. These functions are 
only available if supported by your SIM card.