Nokia N81 - Glossary of PIN and lock codes

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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 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 (also known as 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.

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 service provider whose SIM
card is in your device.

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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.