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Anleitung Zusammenfassung
management. Press to see a list of user certificates, if available. Options in the certificate management main view are: Certificate details, Delete, Trust settings, Mark/Unmark, Help, and Exit. Digital certificates are used to verify the origin of browser pages and installed software. However, they can only be trusted if the origin of the certificate is known to be authentic. Digital certificates are needed if you want to: • Connect to an online bank, another site, or remote server for actions that involve transferring confidential information. • Minimize the risk of viruses or other malicious software and be sure of the authenticity of software when downloading and installing software. Authority certificates are used by some services, such as banking services, for checking signatures or server certificates or other authority certificates. User certificates are issued to users by a Certifying Authority. Important: Although 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. VIEWING CERTIFICATE DETAILS—CHECKING AUTHENTICITY You can only be sure of the correct identity of a browser gateway or a server when the signature and the period of validity of a browser gateway or server certificate have been checked. [ 46 ] Settings You will be notified on the phone’s display: • If the identity of the browser server or gateway is not authentic. • If you do not have the correct security certificate in your phone. To check certificate details, scroll to a certificate and select Options> Certificate details. When you open certificate details, Certificate management checks the validity of the certificate and one of the following notes may appear: • Certificate not trusted—You have not set any application to use the certificate. For more information, see “Change the trust settings of an authority certificate” on p. 47. • Expired certificate—The period of validity has ended for the selected certificate. • Certificate not valid yet—The period of validity has not yet begun for the selected certificate. • Certificate corrupted—The certificate cannot be used. Contact the certificate issuer. Important: 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 phone are correct. CHANGE THE TRUST SETTINGS OF AN AUTHORITY CERTIFICATE Scroll to an authority certificate and select Options> Trust settings. Depending on the certificate, a list of the applications that can use the selected certificate is shown. For example: Services / Yes—the certificate is able to certify sites. Application manager / Yes—the certificate is able to certify the origin of new software. Internet / Yes—the certificate is able to certify e-mail and imaging servers. Important: Before changing these settings, you must make sure that you really trust the owner of the certificate and that the certificate really belongs to the listed owner. [ 47 ] • CALL RESTRICTION (SYSTEM SERVICE) Call restriction allows you to restrict the making and receiving of calls with your phone. For this function, get the restriction password from your service provider. 1 Scroll to one of the restriction options. 2 Select Options> Activate to request the system to set call restriction on, Cancel to set the selected call restriction off, or Check status to check if the calls are restricted or not. • Select Options> Edit restriction passw. to change the restriction password. • Select Options> Cancel all restrictions to cancel all active call restrictions. Note: When calls are restricted, calls may be possible to certain emergency numbers programmed into your phone (911 or other official emergency numbers). Call restricting affects all calls, including data calls. You cannot have restriction of incoming calls and call forwarding or fixed dialing active at the same time. • SYSTEM System selection Choose Automatic to set the phone to automatically search for and select one of the cellular systems available in your area. Or, choose Manual if you want to select the desired system manually from a list of systems. If the connection to the manually selected system is lost, the phone will sound an error tone and ask you to select a system again. The selected system must have a roaming agreement with your home system, that is, the operator whose SIM card is in your phone. Note: Roaming agreement—An agreement between two or more system service providers to enable the users of one service provider to use the services of other service providers. [ 48 ] Settings Cell info display Select On to set the phone to indicate when it is used in a cellular ...