Samsung SGH-E316CSAAWS - Manual (Page 165)

Access Codes
161
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.
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 123 (Menu 6.5.7).
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.
2. Enter a new PIN2 of your choice and press the OK
soft key.
3. When the Confirm PIN2 message displays, enter
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.