Samsung SGH-X427 - Manual (Page 128)

Access Codes
123
PIN
The Personal Identification Number or PIN (4 to 8 digits)
protects your SIM card against unauthorized use. It is
usually supplied with the SIM card.
If you enter an incorrect PIN three times in succession, the
code is disabled and cannot be used until you re-enable it
by entering the PUK. See below.
PUK
The 8-digit PUK (PIN Unblocking Key) is required to
change a disabled PIN. The PUK may be supplied with the
SIM card. If not, contact your service provider.
To re-enable your PIN:
1. Enter the PUK and press the OK soft key.
2. Enter a PIN of your choice and press the OK soft key.
3. When the Confirm New PIN message displays, enter
the same code again and press the OK soft key.
When you enter an incorrect PUK ten times in succession,
the SIM card becomes invalid. Contact your service
provider for a new card.
To See
activate/deactivate the
PIN Check feature page 82
(Menu 4.5.1).
change the PIN page 83
(Menu 4.5.2).