I am on a cruise ship at the moment in Europe and have enabled the Orange 30Mb per day plan for £3. I am also using the iphone to tether my ipad. Because my access to wifi is very sporadic I am trying to be very sparing with use of data. Is there a way of turning on data roaming but avoiding unexpected surprises e.g. Photos syncing to the photo stream on iCloud ? I activated my wife's O2 25MB plan as well and the first day without doing anything I was aware that was using data I blew through 84 MB. Fortunately, all I got was an admonishing text from O2 saying don't do it again. It could have been something like Dropbox syncing but who knows.