Bellow is shown the exact method to insert the unlock codes for LG B1200

1 - Switch ON your phone with an Allowed SIM Card,
2 - Then compose :1945#*5101#
3 - Go to "Menu" and then to "Settings",
4 - Then select "Security",
5 - To finish select "Network Provider" and select "Desactivate"
6 - Enter the Unlock Code we send to you.

Need an LG B1200 unlock code,can get it for less that 3$ :Lg unlock codes