You need to be very careful of the data charges while roaming overseas. Not because the charges are ridiculously high at $16 per meg. But because Telstra Australia lie about the amount of data you download.
I recently opened a 0.387 meg data connection while roaming in the USA. Only to be charged $92.39 for the privilege.
Lets just say hypothetically that I did not know exactly how much data I was downloading, and ripped into the maximum possible data that could have been downloaded in the 1:23 (1 min 23 seconds). I could not have downloaded that amount of data on a 3 G Connection even if it was a good connection and not the CRAP T mobile service that is on offer in LA.
So bottom line. They cheat you, and don’t provide you with proof or even the data downloaded in that time.