Samsung SGH-P735MSATMB - Manual (Page 150)

Access codes
149
If you enter an incorrect PIN2 three times in succession, the
code is disabled and you cannot access the functions until you
re-enable it by entering the PUK2.
To change the PIN2, see page 142.
PUK2
The 8-digit PUK2 (PIN Unblocking Key 2), supplied with some
SIM cards, is required to change a disabled PIN2. If you lose the
code, contact your service provider.
To re-enable your PIN2:
1. Enter the PUK2 and press the OK soft key or key.
2. Enter a new PIN2 of your choice and press the OK soft key or
key.
3. When the Confirm PIN2 message displays, enter the same code
again and press the OK soft key or key.
If you enter an incorrect PUK2 ten times in succession, you will
not be able to access the functions requiring the PIN2. Contact
your service provider for a new card.