Nokia N97 - Manual (Page 108)

Lock if SIM card changed — Set the device to ask for the
lock code when an unknown SIM card is inserted into your
device. The device maintains a list of SIM cards that are
recognized as the owner’s cards.
Remote phone locking — Enable or disable remote lock.
Closed user group — Specify a group of people to whom
you can call and who can call you (network service).
Confirm SIM services — Set the device to ask for
confirmation when you are using a SIM card service (network
service).
Manage certificates
Digital certificates protect your content when transferring
confidential information. Certificates should be used when
connecting to an online bank or another site, or to a remote
server for actions that involve transferring confidential
information.
Certificates should also be used when 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
Menu > Settings and Phone > Phone mgmt. >
Security settings > Certificate management and select
the desired certificate type.
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.
Security module
The security module provides security services for different
applications.
Select
Menu > Settings and Phone > Phone mgmt. >
Security settings > Security module and the desired
security module.
View security module details
Select Options > Security details .
Restore original settings
You can reset some of the settings to their original values. All
active calls and connections must be ended.
Select
Menu > Settings and Phone > Phone mgmt. >
Factory settings . To restore the settings, you need to enter
the lock code.
After resetting, the device may take a longer time to power
on. Documents and files are unaffected.
© 2011 Nokia. All rights reserved. 108