I live in Tucson, Arizona. Last night I was surprised to see a 3G signal on my unlocked iPhone 4 with T-mobile. The 3G signal lasted about 20 minutes and as I started to drive it soon went back to EDGE. I'm thinking they are still testing?? I called another friend who also lives in Tucson and he also noticed a 3G signal for a short period of time. What do you guys think? Will T-mobile be ready by the end of the year? Don't be surprised to see those 3G signals popping out pretty soon!