I have mentioned this before.. and i'll state it again. The 4G network over here is bogus.
When carriers were starting to have 3G over other carriers 2G, that was a huge thing to help push sales.
So... when the 4G technology became public knowledge, the carriers were all to eager to state that they "have 4G" networks.
Uh... not really... they have rolled out just the basics to start being able to support 4G... more or less just so they can say they have it. ATT in particular.
I was reading this post and decided to Google a bit on it to see if it has improved since i last looked.This is the first link that I found.