Nokia N90

Page 111
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Tools
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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 and 
is supported by UMTS mobile phones. 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 
phone.
Lock code (also known as security code)—This code (5 
digits) can be used to lock the phone to avoid unauthorised 
use. The factory setting for the lock code is 12345. To 
avoid unauthorised use of your phone, change the lock 
code. Keep the new code secret and in a safe place 
separate from your phone.
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.
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. 
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 details
, 
Delete
, 
Trust settings
, 
Mark/Unmark
, 
Help
, and 
Exit
.
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 
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