On the AT&T Network, here is how to unlock the LG CU920 (screenshots below):
Put a AT&T or Cingular SIM in the phone; it does not have to be an active SIM
Enter *#865625#
Message Displayed: SIM Unlock Process
Select “OK”
Select “Unlock SIM”
Select “Network Unlock”
Enter the 16 digit unlock code*
Select “OK”
Re-enter the 16 digit unlock code
Select “OK”
Device should say: Network Lock Deactivated
Your phone is unlocked.
Phone may automatically reboot.
*The 16 digit code can be obtained by calling AT&T Technical Support and given the representative the IMEI number. The IMEI number for your specific device can be obtained by the following: *#06#You will need this number in order to obtain the Subsidy Unlock Code from AT&T.
hope it helps
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