Bellow is shown the exact method to insert the unlock codes for LG GB250/ GB250G Madison

1.Power on your phone without SIM card
2.Enter 2945#*505#
4.From the menu that pops up select "SIM unlock"
5.Enter unlock code and press OK
6.The phone will then reboot and the unlock is complete

or

1.Power phone on with no SIM
2.Dial 2945#*71001#
3.Dial unlock code

Need an LG GB250/ GB250G Madison unlock code,can get it for less that 3$ :Lg unlock codes