LG U8150 User Manual page 246

Settings
9.6.2 Change codes
You can change PIN, PIN2, the mobile phone password and the call
barring password.
9.6.2.1 PIN
PIN is the abbreviation of Personal Identification Numeric, and is
used to restrict the use of an unauthenticated user.
PIN Password Change Procedure
1. Select 'PIN' from the 'Password settings' list and then press
[Select].
2. Input the current PIN,and press [Select].
3. Input the new PIN,and press [Select].
4. Input the new PIN once again,and press [Select ].
- If the PIN is different from that of step 3, the procedure is
restarted from step 3.
5. When the PIN is properly changed, a "Successfully Changed"
message as well as new PIN code appears. With an incorrect PIN
input in step 2, the procedure is restarted from step 2, and the
remaining allowed numeric of input attempts is decreased by 1.
6. Press the Back key in the PIN code input window to return to the
previous step.
* 3 incorrect PIN code entries in the PIN code input window would
invalidate the PIN code. In this case, you have to input the PUK
(PIN Unblock Key) code to configure the PIN code again. The
maximum allowed numeric of attempts of PUK input is 10 times.
10 occasions of incorrect PUK entries would limit the mobile
phone use.
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U8150 User Guide