Samsung SGH-C225NBATMB - Manual (Page 113)

Access Codes
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maximum cost of a call. These functions are available if
supported by your SIM card.
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, refer to “Change PIN” on page 84
(Menu 5.5.6).
PUK2
The 8-digit PUK2 (Personal 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, proceed as follows.
1. Key in the PUK2 and press the OK soft key.
2. Enter a new PIN2 of your choice and press the OK soft key.
3. When the Confirm PIN2 message is displayed, key in the
same code again and press the OK soft 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.