iPhone users will have to wait at least another 60 days for our US$199 3G iPhones, but in the mean time T-Mobile will be rolling out their new 3G data service in a bunch of cities beginning on 01 May (this Thursday) according to Boy Genius Reports.
They even posted this stealth-looking screenshot that looks like it's from some sort of CEO presentation:While iPhones are sold carrier locked to AT&T, both AT&T and T-Mobile use GSM networks and both can uses each other's towers interchangeably.
Update: I'm unclear whether T-Mobile is implementing HSUPA or HSDPA for their 3G data network, but theoretically iPhone users should be able to get 3G data service on the T-Mobile network in the above-mentioned cities.
HSUPA is essentially an updated version of HSDPA but with faster upload speeds (2Mbps vs. 384Kbps)
What is HSDPA? HSDPA (High Speed Downlink Packet Access) is the next generation of the UMTS technology. HSDPA is an add-on solution to the 3GPP releases specifications. HSDPA employs new techniques in the protocol and channel structure to achieve theoretical data rates of up to 14.4Mbps. Another advantage of HSDPA is its backwards compatibility with UMTS.
What is HSUPA? HSUPA(High Speed Uplink Packet Access) is another release to the evolving 3GPP standards. HSUPA employs an extremely efficient procedure for sending data on the uplink channel. The theoretical speed for data on the uplink is 5.76Mbps and the downlink will achieve HSDPA theoretical speeds of 14.4Mbps