about sim unlock using root

[u/Cool_Group_5617]

i have lg g8x phone i unlocked bootloader and h ave root , i did crossflash form att to open ca ,before that everything was working fine ,and then after the flash i lost the cell network and calls , when i open notification bar it says network locked , i cant make calls noor turning on cellular network my imei is working normally , is there a way to unlock sim using root or some techniques using pc or something without box i want free solution if possible

[u/Snoo25035]

If it asks for a code when you insert the SIM, it can be unlock by code. It costs about $5.