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■Cache memory

A cache is a memory location that is used to store data temporarily. If you have
tried to access or have accessed confidential information requiring passwords,
empty the cache after each use. The information or services you have accessed is
stored in the cache.
To empty the cache while browsing, select Options> Other options > Clear the
cache; in the standby mode, select Menu> Web > Clear the cache.

■Browser security

Security features may be required for some services, such as online banking or
shopping. 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.
Security module
The security module improves security services for applications requiring a
browser connection, and allows you to use a digital signature. The security
module may contain certificates as well as private and public keys. The
certificates are saved in the security module by the service provider.
To view or change the security module settings, select Menu> Settings >
Security> Security module settings.
Certificates
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.
Before changing any certificate settings, you must make sure that you really trust
the owner of the certificate and that the certificate really belongs to the listed
owner.
There are three kinds of certificates: server certificates, authority certificates, and
user certificates. You may receive these certificates from your service provider.