Nokia 8600 Luna

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Select Menu Settings Security and from the following options:
PIN code request and UPIN code request — to set the phone to ask for 
your PIN or UPIN code every time the phone is switched on. Some SIM 
cards do not allow the code request to be turned off.
PIN2 code request — to select whether the PIN2 code is required when 
using a specific phone feature which is protected by the PIN2 code. 
Some SIM cards do not allow the code request to be turned off.
Call barring service — to restrict incoming calls to and outgoing calls 
from your phone (network service). A barring password is required.
Fixed dialling — to restrict your outgoing calls to selected phone 
numbers if this function is supported by your SIM card
Closed user group — to specify a group of people whom you can call and 
who can call you (network service)
Security level Phone — to set the phone to ask for the security code 
whenever a new SIM card is inserted into the phone. If you select 
Memory, the phone asks for the security code when the SIM card 
memory is selected, and you want to change the memory in use.
Access codes — to change the security code, PIN code, UPIN code, PIN2 
code, or barring password
Code in use — to select whether the PIN code or UPIN code should be 
active
Authority certificates or User certificates — to view the list of the 
authority or user certificates downloaded into your phone. See 
Certificates p. 87.
Security module settings — to view Security module details, activate 
Module PIN request, or change the module PIN and signing PIN. See also 
Access codes p. 8.
■ Phone software updates
Your service provider may send phone software updates over the air 
directly to your device. This option may not be available, depending on 
your phone.