I can't imagine that being the fault of anything other than your carrier -- I'm Norwegian, and I don't think I pay any more for roaming (about 0.05 USD per MB)

I can't imagine that being the fault of anything other than your carrier -- I'm Norwegian, and I don't think I pay any more for roaming (about 0.05 USD per MB) in the EU than EU citizens do. I visited Switzerland a few years back, and I don't remember roaming charges being much higher than in Germany or France.