Samsung SGH-P735MSATMB - Manual (Page 149)

Access codes
148
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, or if you have lost it, contact your service provider.
To re-enable your PIN:
1. Enter the PUK and press the OK soft key or key.
2. Enter a new PIN of your choice and press the OK soft key or
key.
3. When the Confirm New PIN message displays, enter the same
code again and press the OK soft key or key.
If you enter an incorrect PUK ten times in succession, the SIM
card becomes invalid. Contact your service provider for a new
card.
PIN2
The PIN2 (4 to 8 digits), supplied with some SIM cards, is
required to access specific functions, such as setting the
maximum cost of a call. These functions are available if
supported by your SIM card.
To See
activate/deactivate the PIN
Check feature page 140 (Menu 9.6.1).
change the PIN page 140 (Menu 9.6.2).