Nokia N75 User Manual page 127

The UPUK code—(8 digits) is required to change a blocked
UPIN code. If the code is not supplied with the USIM card,
contact the operator whose USIM card is in your device.
Certif. management
Digital certificates do not guarantee safety; they are used
to verify the origin of software.
In the certificate management main view, you can see a
list of authority certificates that are stored in your device.
Press to see a list of personal certificates, if available.
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.
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.
94
View certificate details—check authenticity
You can only be sure of the correct identity of a server
when the signature and the period of validity of a server
certificate have been checked.
You are notified if the identity of the server is not
authentic or if you do not have the correct security
certificate in your device.
To check certificate details, scroll to a certificate, and
select Options > Certificate
certificate details, the validity of the certificate is checked,
and one of the following notes may be displayed:
Certificate not trusted—You have not set any application
to use the certificate. See "Change the trust settings," p. 94.
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.
Change the trust settings
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.
Scroll to an authority certificate, and select
Trust settings. Depending on the certificate, a list of the
applications that can use the selected certificate is shown.
details. When you open
Options >