According to GSM Arena, the specs for 4g are as follows: LTE 700 / 850 / 1700 / 1900 / 2100 - for the D800. That means that even if you use the right APN Settings, you don't actually have the hardware to use it.
Someone correct me if I'm wrong on this, but that's what I'm getting from it...
|d80020c, kitkat, lg g2, lgflashtool|
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