After HSPA 7.2, the HSPA+ upgrade will be integrated into the T-Mobile network over the next several months with a expected nationwide deployment date in mid-2010. HSPA+ will allow for network throughput speeds 3 to 5 times faster than what you see with today's 3G networks. Theoretically, download speeds can reach 21Mbps.
Coming back to HSPA 7.2, not all of T-Mobile's devices will support the faster speeds and it is unclear if a software upgrade will be necessary. The devices that support HSPA 7.2 are the HTC G1, HTC myTouch 3G, Motorola CLIQ, Samsung Behold II, Touch Pro2 and the Dash 3G. If all goes as expected, T-Mobile customers using these models should start to experience faster speeds before the end of the year.