I just got a new Evo yesterday because the old one died out the blue and wouldn't turn back on. The old one was rooted /with the new firmware & running that mean Rom. I rooted on the 14th of July & I live in Atlanta, so when they made 4g available I saw it in my status bar and was very happy .Then seconds later it was gone.On top of that my phone was super slow and not impressive anymore. I thought the root /rom/firmware screwed something up. But ppl told me know firmware updates help and mean Rom is the best Rom ..Well anyway I'm at home right now on my phone ..no root ..no Rom ...old firmware and sometype of way the 4g LTE signal is holding strong. I'm getting like 12-15 down & 11 up and I'm in the house. Usually in the house I got like 5-11 in the house depending on location. When I'm outside it goes much faster. But I don't know just something I noticed.
