I am currently visiting the US in the Chicago area. I have turned off Data Roaming and Push services and have only been using wifi when I can for free. So far so good as I have not used any mobile data which I want to avoid. However I have noticed even though my 3G is turned on I do not get a 3G. More out of interest as it really doesn't affect me but would I get 3G if I turned on the data roaming. I am with O2 in the UK and it seems AT&T is my roaming provider in the Chicago area.