T-Mobile HSPA+ coverage expands to more U.S. cities
The nice part about this particular choice of technology is that it can be done as an upgrade to the existing infrastructure, which bumps up the speed for current devices using the T-Mobile 3G network. Theoretically, download speeds with HSPA+ (aka Evolved HSPA) can be up to about 21Mbps, but in practice they will, of course, be much lower. Users have reported the T-Mobile webConnect(tm) Rocket(tm) Laptop stick to get about 3Mbps in an HSPA+ area with 7Mbps peak, while a 3G smartphone is said to have tripled its access speed compared to an area with no HSPA+ coverage to 1.8Mbps. Moreover, the wait for server response is also reported to be better, which could make all the difference.
source: T-Mobile, PCMag