Default Help 4g?

anybody know how to enable 4G only(WCDMA ONLY) on the AT&T LG G2? I cant find anywhere where you can enable it on stock rom. I know how to get to the LG test menu.
I cant even list how many phones I have had so I will point out the ones I liked:

HTC Vivid(Sold), HTC Droid DNA(sold), HTC One M7(backup phone), Motorola Atrix 4G(sold), HTC One X(AT&T Variant) (Gave it to my dad), LG Optimus G PRO(Sold), Nexus 5(Re-Acquired), LG G2 (Sold).

Current Testing: Chrome X64, Adobe Flash Beta build, and some Android Projects.

Currently: In transition to a LG G3 for AT&T, Google Voice port out pending.