Nokia N90 - Manual (Page 106)

Tools
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be allowed by some SIM cards. See “Glossary of PIN and
lock codes‚" p. 97.
PIN code , PIN2 code , and Lock code —You can change the
lock code, PIN code, and PIN2 code. These codes can only
include the numbers from 0 to 9. See “Glossary of PIN and
lock codes‚" p. 97.
Avoid using access codes similar to the emergency numbers
to prevent accidental dialling of the emergency number.
If you forget any of these codes, contact your service provider.
Autolock period —You can set an autolock period, a
time-out after which the phone automatically locks and
can be used only if the correct lock code is entered. Enter
a number for the time-out in minutes, or select
None to
turn off the autolock period.
To unlock the phone, enter the lock code.
When the device is locked, calls may be possible to the
official emergency number programmed into your device.
Tip! To lock the phone manually, press . A list of
commands opens. Select Lock phone .
Lock if SIM changed —You can set the phone to ask for the
lock code when an unknown SIM card is inserted into your
phone. The phone 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.
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 ( )—You can set the phone 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 unauthorized 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 unauthorized 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 unauthorized use.