Not that T-Mobile can't offer its customers some type of 4G service. The HSPA+ pipeline is the carrier's 4G answer until it starts building out its own LTE network in 2013. And T-Mobile's HSPA+ 42Mbps pipeline is so fast that in a recent test, it actually was faster than Verizon's LTE service in 11 cities. One thing you can say about the other carriers. They don't have their spokesperson zooming along the backroads of the country counting cell towers.
source: YouTube via Phandroid