• CACHE MEMORY
The information or services you have accessed are stored in the cache of your phone. A cache is a buffer memory that stores data temporarily.
To empty the cache while browsing, select Options > Other options > Clear the cache.
To empty the cache in the standby mode, select Menu > Services > Clear the cache.
• BROWSER SECURITY
Security features may be required for some services, such as banking services or shopping on a site. For such connections you need security certificates and possibly a security module, which may be available on your SIM card. For more information, contact your service provider.
CERTIFICATES
There are three kinds of certificates: server certificates, authority certificates, and user certificates.
•Server certificates are used to improve security in connections between the phone and the gateway. The phone receives the server certificate from the service provider before the connection is established and its validity is checked using the authority certificates that are saved on the phone. Server certificates are not saved.
The security icon 
is displayed during a connection if the data transmission between the phone and the gateway (identified by the IP address in the Edit active service settings) is encrypted.
However, the security icon is not an indication that the data transmission between the gateway and the content server (place where the requested resource is saved) is secure. It is up to the service provider to secure the data transmission between the gateway and the content server.
•Authority certificates are used by some services, such as banking, for checking the validity of other certificates. Authority certificates can be either saved in the security module by the service provider, or they can be downloaded from the network, if the service supports the use of authority certificates.
•User certificates are issued to users by a Certifying Authority. User certificates are required, for example, to create a digital signature and they associate the user with a specific private key in a security module.
While 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 phone are correct.
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