Certificate Management - Nokia N91 User Manual

When calls are limited to closed user groups, calls still may
be possible to the official emergency number programmed
into your device.
Confirm SIM services
device to display confirmation messages when you are
using a SIM card service.
Glossary of PIN and lock codes
If you forget any of these codes, contact your service
provider.
Personal identification number (PIN) code—This code
protects your SIM card against unauthorised use. The PIN
code (4 to 8 digits) is usually supplied with the SIM card.
After three consecutive incorrect PIN code entries, the PIN
code is blocked, and you need to unblock it before you can
use the SIM card again. See the information about the PUK
code in this section.
UPIN code—This code may be supplied with the USIM card.
The USIM card is an enhanced version of the SIM card. The
UPIN code protects the USIM card against unauthorised
use.
PIN2 code—This code (4 to 8 digits) is supplied with some
SIM cards, and is required to access some functions in your
device.
96
(network service)—You can set the
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Lock code (also known as security code)—This code
(5 digits) can be used to lock the device to avoid
unauthorised use. The factory setting for the lock code is
12345. To avoid unauthorised use of your device, change
the lock code. Keep the new code secret and in a safe place
separate from your device.
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 device.
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 device.

Certificate management

Digital certificates do not guarantee safety; they are used
to verify the origin of software.
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.