A Personal Unlock Code (PUC), also known as a PIN Unlocked Key (PUK), is used in GSM mobile phones
Most mobile telephones offer the feature of personal identification number
(PIN) protection. After switching on the phone, if the PIN security
function is active, the user is requested to enter a 4-8 digit PIN
enabling the phone's non-emergency calling functions. If the wrong PIN
is typed in more than three times, either the SIM card,
the device or both become locked. They can be reverted to their
original unlocked state by entering a PUC, provided by the service
operator through verification. If the wrong PUC is entered ten times in a
row, the device will become permanently blocked and unrecoverable,
requiring a new SIM card. Cellular phone users are therefore advised by
most providers to keep their PUC written down in a safe place separate
from the device.
The PUC (PUK) is a SIM-specific code assigned by the service
provider. It is near-impossible to guess and enter it; thus, if a user
does not know his or her PUC and is prompted for it, it should be
obtained from the service provider.
Once you enter the PUK code, you must set a pin. The PUK (Personal
Unblocking Key) and PUK2 are used to unlock the PIN and PIN 2 codes
respectively if your SIM card is blocked
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