Nokia X6-00 User Guide - Page 177

Settings 177 Confirm SIM services - Set the device to display confirmation messages when you are using a SIM card service (network service). Certificate management Select Menu > Settings and Phone > Phone mgmt. > Security > Certificate management. 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. Select from the following: Authority certificates - View and edit authority certificates. Trusted site certificates - View and edit trusted site certificates. Personal certificates - View and edit personal certificates. Phone certificates - View and edit device certificates. Digital certificates do not guarantee safety; they are used to verify the origin of 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.