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See “Glossary of PIN and lock codes, ” p. 97. PIN code, PIN2 code, and Lock code— You can change the lock code, PIN code, and PIN2 code. These codes can only include the numbers from 0 to 9. See “Glossary of PIN and lock codes, ” p. 97. Avoid using access codes similar to the emergency numbers to prevent accidental dialing of the emergency number. If you forget any of these codes, contact your service provider. Autolock period— You can set an autolock period, a timeout after which the device automatically locks and can be used only if the correct lock code is entered. Enter a number for the timeout in minutes, or select None to turn off the autolock period. To unlock the device, enter the lock code. When the device is locked, calls still may be possible to the official emergency number programmed into your device. Tip! To lock the device manually, press . A list of commands opens. Select Lock phone. For information on Lock switch see “Keypad lock (keyguard), ” p. 17. 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 ( network service) —You can specify a group of people to whom you can call and who can call you. When calls are limited to closed user groups, calls still may be possible to the official emergency number programmed into your device. Confirm SIM services ( network service) —You can set the device to display confirmation messages when you are using a SIM card service. Glossary of PIN and lock codes If you forget any of these codes, contact your service provider. Personal identification number (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 PIN code is blocked, and you need to unblock it before you can use the SIM card again. See the information about the PUK code in this section. 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. The UPIN code protects the USIM card against unauthorized use. 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 (also known as 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. Personal unblocking key (PUK) code and PUK2 code— 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 operator whose USIM card is in your device. Certificate management Digital certificates do not guarantee safety; they are used to verify the origin of software. Glossary: Digital certificates are used to verify the origin of the XHTML or WML pages and installed software. However, they can only be trusted if the origin of the certificate is known to be authentic. Tools Tools In the certificate management main view, you can see a list of authority certificates that are stored in your device. Scroll right 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 actions that involve transferring confidential information. They should also be used if you want to reduce the risk of viruses or other malicious software and be sure of the authenticity of software when downloading and installing software. Important: Even if the use of certificates makes the risks involved in remote connections and software installation considerably smaller, they must be used correctly in order to benefit from increased security. The existence of a certificate does not offer any protection by itself; the certificate manager must contain correct, authentic, or trusted certificates for increased security to be available. Certificates have a restricted lifetime. If Expired certificate or Certificate not valid yet is shown even if the certificate should be valid, check that the current date and time in your device are correct. View certificate details—check authenticity You can only be sure of the correct identity of a server when the signature and the period of validity of a server certificate have been checked. You are notified on the device display if the identity of the server is not authentic or if you do not have the correct security certificate in your device. To check certificate details, scroll to a certificate, and ...