How to set up LTE on most custom ROMs (all LG G2 variants)
In many forums I saw people complaining on their LTE connections or even lost the option to set LTE.
I tried this and works fine on many custom ROMs
Type one of this codes in the phone dialer
(Other models just type model number between * and #)
Now you will see a hidden menu, follow the route: LTE-Only , Modem Settings , RAT Selection
Press LTE only, and restart your phone.
Then enter the hidden menu again, go to the same route, press: GSM / WCDMA / LTE auto.
Thats all, you are done!
Don't forget to hit the thanks button on the left if this works for you.