How to Enter Unlock Codes on Cingular AT&T LG CU500, LG CU400

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Unlock Method :

1. Insert non-Cingular SIM card.
2. Power on the handset. Phone will display "Invalid SmartChip"
3. (IF THE PHONE DOES NOT DISPLAY INVALID SMARTCHIP, PLEASE POWER OFF AND ON AGAIN)
4. In Idle screen, enter 159753#*#. Phone will display "Enter NCK, Remaining 5
5. Enter the 8 digit SIM unlock code.
6. Select "OK". The handset is now successfully unlocked.