I had just purchased a Galaxy Note a few weeks ago. Speed Tests in Houston fluctuated... connected, not connected.... connected, not connecetd... It would time-out due to "no data connection", but wait 3 seconds and have blazing, mind-numbing speedtests at 45 mb/sec.
Coming from 3G, anything over 5 mb/sec really blew my mind.
Oddly, even in hi-speed 4G LTE areas, some pages would time out and not load at all. I could then walk 3 paces and download a 5 minute video in a flash.
My wife's 3G was consistent and kicked my butt up and down the street.
After a few weeks, back and forth with customer service and multiple techs, sadly, I returned it. Appreciating 3G more than ever now.
Then, I saw this article in the Houston Chronicle. The first few lines of the article say that the article has been updated with ATT rep's confirmation that the problems are now resolved (and the article was softened up a bit as it was originally kinda harsh), but as of Sept 21, I can tell you that speeds and connectivity in Houston still suffer. It's really pitiful.
It seems to me that the 4G signal is sent out in waves or pulses, rather than a steady blanket of coverage.
Anyway, check this out, especially the comments that follow... AT&T’s LTE network in Houston is having connection problems [Updated] | TechBlog | a Chron.com blog