Carriers have been fucking us over with data plans for years now. I've had bills in the USA over $1,500 and in Asia far worse.
I finally turn the data off when roaming. It's just not worth it, but it's such a convenient option. I hate worrying about checking a site and it costing a fortune.
FCC to vote on (reasonable rates) mandatory wireless data roaming
http://news.cnet.com/8301-30686_3-20...#ixzz1In9yYroM
They need to come up with an international unlimited roaming option that's reasonable.