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edit: Looks like I stumbled into an older GPRS network and not T-Mobile's 3G network. As someone stated, landing on a 3G network would be indicated by "3G or H" and not "G".
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So I'm driving around running errands when I noticed that my Data indicator was switching from Edge (2G) to 3G back and forth. Reading that T-Mobile was planning to add the 1900mhz capability to their network, I was optimistic.
Currently, T-Mobile is running a 1700/2100mhz frequency band that isn't compatible with unlocked phones. To run at 3/4G you must have a T-mobile branded phone that is capable of receiving the 1700/ 2100 mhz frequency band.
So I took out my Tablet and tested the speed and was surprised at how slow it really was. Below, you will see screenshots from my Samsung Galaxy Tab 7.7 running the Speedtest.
This is the speedtest done at home. Notice the "E" for Edge. I am getting .10Mbps for both download and upload speed.
(click image for full size image)
So driving around, I noticed that there is a Business Park area (About the size of 6-10 blocks) that is getting T-Mobile's 3G network (1900mhz) . The test below shows how slow the 3G speed is. I guess their antenna is still under construction.
After testing T-Mobile's 3G network, I drove a block and my status went back to E (for Edge). I ran a quick test and this time, there was a boost in speed when compared to the 1900Mhz frequency band.
Speedtest shows a speed of .04Mbps for both upload and download speeds. This is slower than the Edge network!
Here is one last test on T-Mobile 3G network. (1900 mhz).