Nokia 6681 User Manual page 97

Personal unblocking key (PUK) code and PUK2 code—
These codes (8 digits) are required to change a blocked PIN
code or PIN2 code, respectively. If the codes are not
supplied with the SIM card, contact the operator whose
SIM card is in your phone.
UPUK code—This 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 phone.
Wallet code—This code is required to use the wallet
services. See "Wallet"
Certificate 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 phone.
Press to see a list of personal certificates, if available.
Options in the certificate management main
view are Certificate
Mark/Unmark, Help, and Exit.
Glossary: Digital certificates are used to verify the
origin of the XHTML or WML pages and installed
software. However, they can only be trusted if the
origin of the certificate is known to be authentic.
96
on page 71.
details, Delete, Trust settings,
Copyright © 2005 Nokia. All rights reserved.
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
Certificate not valid yet
certificate should be valid, check that the current
date and time in your phone are correct.
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.
Expired certificate or
is shown even if the