There is a direct link to all major US carrier (including all forums for that carrier) in the LG G3 General forum.
http://xdaforums.com/showthread.php?t=2818549
Sent from my LGLS990
Thanks for the link. I'll bookmark it.
However, I was also trying to point out that the General "LG G3" forum has subforums for carrier specific development (Sprint G3 Android Development), but none of the other categories (General, Q&A, Accessories, Themes and Apps) for the carriers that this "Sprint LG G3" subforum has...
So, basically, there are 2 different "Sprint G3 Android Development" subforums, that link to different places.
Edit: Apparently they did actually merge the "Sprint G3 Android Development" subforums...