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How to enter code for LG GB250
How to enter NCK code in LG GB250
Insert an original simcard and turn phone on (code can also be entered without SIM card)
Enter sim PIN if required
Enter 2945#*71001#
From the menu that pops up select "SIM unlock"
Enter unlock code you received from Cellcorner and press OK
The phone will then reboot and the unlock is complete