Nokia N93 User Guide - Page 110
Certificate management, Lock if SIM changed, Closed user group, Confirm SIM services
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Tools Lock if SIM changed-You can set the device to ask for the lock code when an unknown SIM card is inserted into your device. The device maintains a list of SIM cards that are recognized as the owner's cards. Closed user group-You can specify a group of people to whom you can call and who can call you (network service). When calls are limited to closed user groups, calls may be possible to the official emergency number programmed into your device. Confirm SIM services-You can set the device to display confirmation messages when you are using a SIM card service (network service). Glossary of PIN and lock codes If you forget any of these codes, contact your service provider. PIN code-This code protects your SIM card against unauthorized use. The PIN code (4 to 8 digits) is usually supplied with the SIM card. After three consecutive incorrect PIN code entries, the code is blocked, and you need the PUK code to unblock it. UPIN code-This code may be supplied with the USIM card. The USIM card is an enhanced version of the SIM card and is supported by UMTS mobile phones. PIN2 code-This code (4 to 8 digits) is supplied with some SIM cards, and is required to access some functions in your device. Lock code (security code)-This code (5 digits) can be used to lock the device to avoid unauthorized use. The factory setting for the lock code is 12345. To avoid unauthorized use of your device, change the lock code. Keep the new code secret and in a safe place separate from your device. If you forget the code, contact your service provider. PUK and PUK2 codes-These codes (8 digits) are required to change a blocked PIN code or PIN2 code, respectively. If the codes are not supplied with the SIM card, contact the operator whose SIM card is in your device. UPUK code-This code (8 digits) is required to change a blocked UPIN code. If the code is not supplied with the USIM card, contact the service provider whose USIM card is in your device. Certificate management Digital certificates do not guarantee safety; they are used to verify the origin of software. In the certificate management main view, you can see a list of authority certificates that are stored in your device. Press to see a list of personal certificates, if available. Digital certificates should be used if you want to connect to an online bank or another site or remote server for 110