The odd thing is that here where I live in Fairfax County (near Fairfax City), I actually have been getting 4G signal in a lot of places.
It is only recently that I have noticed that my phone is on 3G more frequently than before.
More annoying to me, through, is that in some areas, frequently when my phone is connected to 4G, either my data is incredibly slow, or does not work at all. A few times, I have had to actually switch my phone to CDMA Only mode, just to get usable data.