The LG Nitro HD is the best LTE phone on AT&T's network. If your stars align in such a way that you're covered by AT&T's tiny (but flourishing) LTE network, the LG Nitro is the best way to go.
The blazing fast internet displays on a gorgeous 4.5-inch display, offering a 1280 x 720 pixel resolution, at 329 pixels per inch.
LTE might be the ultimate battery leech, but the 1830 mAh battery offers at least a little fight.
If you're not currently covered by AT&T's LTE network, this might not be the phone for you. AT&T's network has been growing rapidly, but unless you're specifically looking for something to tear through the internet, there's still no reason to get an LTE phone on AT&T.