Nokia N93 - Page 243

Tools
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Lock if SIM changed—You can 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.
Closed user group—You can specify a group of people to
whom you can call and who can call you (network
service).
When calls are limited to closed user groups, calls may be
possible to the official emergency number programmed
into your device.
Confirm SIM services—You can set the device to display
confirmation messages when you are using a SIM card
service (network service).
Glossary of PIN and lock codes
If you forget any of these codes, contact your service
provider.
PIN code—This code protects your SIM card against
unauthorized use. The PIN code (4 to 8 digits) is usually
supplied with the SIM card. After three consecutive
incorrect PIN code entries, the code is blocked, and you
need the PUK code to unblock it.
UPIN code—This code may be supplied with the USIM
card. The USIM card is an enhanced version of the SIM
card and is supported by UMTS mobile phones.
PIN2 code—This code (4 to 8 digits) is supplied with some
SIM cards, and is required to access some functions in your
device.
Lock code (security code)—This code (5 digits) can be used
to lock the device to avoid unauthorized use. The factory
setting for the lock code is 12345. To avoid unauthorized
use of your device, change the lock code. Keep the new
code secret and in a safe place separate from your device.
If you forget the code, contact your service provider.
PUK and PUK2 codes—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 service provider whose USIM card
is in your device.
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 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
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