? The maximum speed over the T-mobile 4G network in those cities is about 7 Mbps (I believe T-Mobile's phones are actually throttled at 7.2 Mbps) - while Sprint 4G on an EVO can peak over 10. I'm not sure where these tests are getting their claims, unless they're basing it on theoretical speeds, which are nearly irrelevant. HSPA+ (T-mobile) may theoretically be able to reach 100Mbps, and WiMax (Sprint) can reach 1 Gbps, but if the phones and network don't support it (and none of them do) than it is merely a future ambition.
At this point, nearly all the supposed 4G networks operate at similar speeds (and can not technically be referred to as 4G.....a standard which has not been met yet. What exists is 3G networks on steroids, using "4G" merely as a marketing term.)
date=1287090184]T-Mobile's 4G network is already live in major cities, and is rolling out into other areas as we speak. Its 3X faster than Sprint's (according to independent tests).