I think Texas has some of the fastest AT&T LTE speeds available. The fastest I've ever seen is Dallas (68 Mbps). It was a close second to San Francisco. It looks like Houston speeds are comparable to Dallas'.
Today I was very close to downtown Miami and finally remembered to do a Speedtest. I thought it was lousy at my house. But this is insane. I wonder if I just happen to have a lousy LTE radio in my iPhone. Seriously considering taking it in to the Genius Bar! I have a year since the date of purchase, right? Except, they wouldn't replace it with a brand new unit, correct?