I'm due an upgrade at t mobile so I thought I'd call them up and see if my upgrade price would be a lot cheaper than buying sim free (doesn't usually happen as I'm on half price line rental for life so they make me pay for upgrades) and the guy on the other end of the phone said they haven't been told about the n900 being out end of Sept/beginning of Oct so he reckons it wouldn't be available until the end of October.