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Regarding to problem you encounter first, You need to call the phone company that sold you the phone card to unlock the phone.The PUK code is asked if you enter a wrong PIN 3 times. Second, You need to call the phone company that released the SIM card, they can retrieve the puk code from a database for free. Third, In your case you need to contact your SIM card phone provider technical support to unlock the SIM.
Note: The PIN and PUK are related to the SIM card, not to the phone. If you replace the SIM card with a different one, then the phone will not ask for the PUK anymore.
remove your sim card , note down the 18 digit sim no. , put ur sim card back in , get the helpline no. of your servive provider ,tell them your phone is asking puk no . they verify your details and they will give u a code insert that into ur phone and bingo work.
Check you starters manual for the preinstalled lock on your phone. This should allow you to change the lock code to soemthing more familiar. If this doesnt work, try calling the lg provider nearest you for help.
On the AT&T Network, to unlock the LG Shine or CU720, it’s pretty simple:
Put a AT&T or Cingular SIM in the phone; it does not have to be an active SIM
Enter *#865625# then the 16 digit unlock code*
Device should say: Network Lock Deactivated
Phone may automatically reboot
*The 16 digit code can be obtained by calling AT&T Technical Support and given the representative the IMEI number. In exchange they will give you the Subsidy Unlock Code. To obtain the IMEI number, type *#06# on your device. This is a 17 digit number and it is not the same as the unlock code, this is the IMEI number to give to AT&T Technical Support in exchange for the 16 digit Subsidy Unlock Code.