The speeds on HSPA+ are limited by the available PHONE HARDWARE (i.e. the 3G transceiver in your phone/USB modem) more than the network right now.
The BlackBerry Bold 9700 has hardware capable of delivering download speeds as high as 3.6 mbps.
The absolute best HSPA+ hardware T-Mobile has right now, both phones and USB modems, can deliver download speeds as high as 7.2 mbps. I don't know of any phones or modems that can deliver a speed faster than that right now. They'll be here eventually, but it's a waiting game for the hardware on the user's end to catch up to what the network can deliver.
Last edited by Jack T. Chance : 10-28-2010 at 11:38 AM.