Going back to my original request, and after reading between the lines of what Yackie, maxROAM and now even UM* are saying (and people here have been saying too) it looks like all of these will be offering cheaper US in/out in the next 3 months anyhow. My trips aren't for a while anyhow, so it looks like I will just stay put for a little while and not buy a T-Mobile SIM just yet.

Let's see what comes out of these guys. Not too sure if it will be dual IMSI or some other technology but if they can figure something out for us to get anything in the region of 10c-15c/min with a local USA DID that I can activate for whilst I am there only, I think that will solve not only mine but most travellers needs.

* = http://www.eweek.com/article2/0,1895,2215895,00.asp