maintains a list of SIM cards that are recognisedas the owner’s cards.● Closed user group — You can specify a groupof people to whom you can call and who can callyou (network service).When calls are limited to closed user groups, callsmay be possible to the official emergency numberprogrammed into your device.● Confirm SIM services — You can set the deviceto display confirmation messages when you areusing a SIM card service (network service).Certificate managementPress , and select Tools > Settings >General > Security > Certificate management.Digital certificates do not guarantee safety; they areused to verify the origin of software.In the certificate management main view, you cansee a list of authority certificates that are stored inyour device. Scroll right to see a list of personalcertificates, if available.Digital certificates should be used if you want toconnect to an online bank or another site or remoteserver for actions that involve transferringconfidential information. They should also be usedif you want to reduce the risk of viruses or othermalicious software and be sure of the authenticityof software when downloading and installingsoftware.Important: Even if the use of certificatesmakes the risks involved in remote connections andsoftware installation considerably smaller, theymust be used correctly in order to benefit fromincreased security. The existence of a certificatedoes not offer any protection by itself; thecertificate manager must contain correct,authentic, or trusted certificates for increasedsecurity to be available. Certificates have arestricted lifetime. If "Expired certificate" or"Certificate not valid yet" is shown, even if thecertificate should be valid, check that the currentdate and time in your device are correct.View certificate details—check authenticityYou can only be sure of the correct identity of aserver when the signature and the validity periodof a server certificate have been checked.You are notified if the identity of the server is notauthentic or if you do not have the correct securitycertificate in your device.To check certificate details, scroll to a certificate,and select Options > Certificate details. TheSettings180 Settings
