I have the LS990 (Sprint) so I don't know if it is the same for other devices (comment below if it works for you)
I am not responsible for any damage you do or any mistakes.
ROOT IS REQUIRED
DOWNLOAD THE SHORTCUT MASTER LITE APP IN THE PLAYSTORE: https://play.google.com/store/apps/details?id=org.vndnguyen.shortcutmaster.lite&hl=en
I was messing around with the hiddenmenus in the phone and I found a way to force LTE only on the LG G3. It normally does't give you that option in the Mobile Data network settings because you can't make calls on just LTE yet so if you turn this on, make sure you switch it back to what setting it was before so you can make and receive calls.
Launch Shortcut Master Lite and open the menu to search for "systemselection"
tap on "com.lge.hiddenmenu.vzw_only.SystemSelection" and click launch. Then Grant SU.
Then finally tap on Network mode and you will be able to select LTE only. Again make sure you switch it back so you can receive and make calls.
There you go! I am with Sprint so sometimes data is really slow and for whatever reason sometimes my data would stay on 3G even though I am in an LTE area so this way forces it on.
I have more goodies if you guys want to see them (ex: see what LTE band you are on and and turning them on and off, turning on Lab mode, production mode to Lab mode, etc)
I am not responsible for any damage you do or any mistakes.
ROOT IS REQUIRED
DOWNLOAD THE SHORTCUT MASTER LITE APP IN THE PLAYSTORE: https://play.google.com/store/apps/details?id=org.vndnguyen.shortcutmaster.lite&hl=en
I was messing around with the hiddenmenus in the phone and I found a way to force LTE only on the LG G3. It normally does't give you that option in the Mobile Data network settings because you can't make calls on just LTE yet so if you turn this on, make sure you switch it back to what setting it was before so you can make and receive calls.
Launch Shortcut Master Lite and open the menu to search for "systemselection"
tap on "com.lge.hiddenmenu.vzw_only.SystemSelection" and click launch. Then Grant SU.
Then finally tap on Network mode and you will be able to select LTE only. Again make sure you switch it back so you can receive and make calls.
There you go! I am with Sprint so sometimes data is really slow and for whatever reason sometimes my data would stay on 3G even though I am in an LTE area so this way forces it on.
I have more goodies if you guys want to see them (ex: see what LTE band you are on and and turning them on and off, turning on Lab mode, production mode to Lab mode, etc)