Samsung has launched their first HSUPA (High Speed Upload Packet Access) phone, the SCM-M470, which runs Windows Mobile and seems to be quite a nice phone. You can learn more at http://www.windowsfordevices.com/news/NS8700763418.html
The Sony XPERIA also supports HSUPA. AT&T has been deploying HSDPA and HSUPA .To test the actual trhoughput on your phone go to http://text.dslreports.com/mspeed and try the 1Mb file. Keep in mind actual speeds depend on your phone, the cell tower you are connecting to, distance to the tower, interference and probably most important to consider – number of concurrent users connecting to the same cell tower.