Broadband speed-test results for T-Mobile’s HSPA+ network

I’m at Phoenix Sky Harbor airport waiting for my (delayed) file to Orange County. I was having trouble connecting to Sky Harbor’s free Wi-Fi and so I decided to tether to my G2. The phone was showing all four bars on the HSPA+ network and so I decided to run a speed test. This is what I got:

Broadband speed-test results

The average speed for T-Mobile as reported by speedtest.net is around 2Mbps, so I’m surprised that mine is so high. I ran a few more tests and I got results between 2.5Mbps and 3.5Mbps. What bothers me the most is that T-Mobile’s mobile network provides a better upload speed than the measly 896Kbps that Qwest gives me.