Just thought that I would mention that 800mhz seems to be working in Tysons Corner VA.
I was headed to my car in the deep underground Level D of the garage at the office building where I work, and I heard Signal Check chime with the 800 notification sound. I was, honestly, a little surprised. I looked at my phone and saw that Signal Check was showing strong 800mhz signal.
Two observations, that 800mhz is active in the Tysons Corner area, and that the HTC One M8 is good at pulling in 800mhz.
Sent from my RCT6378W2