If you are referring to the unlock code that would enable you to use the phone on different carriers, then you would need to contact the provider of that unlock code. Now, if you're referring to the PIN code, then you can contact your service provider to ask for it.
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Check my guide on how to unlock screen on any LG device
unlocky.org/unlock-screen/how-to-bypass-lg-lock-screen-without-reset/
call your service provider give then your number if not go toa phone shop and ask them to unlock it!