Is it possible to disable data on the iphone 3G or 3GS completely?

When I travel I want to get a local prepaid sim card and use my phone but everywhere I've been outside the US data is such an incredible ripoff that it basically can't be used (read: dollars per megabyte). If even dare to insert a foreign prepaid simcard into my iphone it tries to retrieve my mail, etc. and drains the card of all the money before I can do anything. Is there anyway to disable the data so that this doesn't happen and I can just run on wifi only when I'm abroad?
International data plans don't make sense either, t-mobile is charging $10-15 per megabyte for roaming data.

Re: hacked phones - actually apple does not screw the international customers they way they do US - you can buy unlocked phones abroad.
Re: difficult to use internationally - agreed and very frustrating especially since there are a few simple features that could easily be added in any update of the OS like a simple switch to turn data on and off. Alot of phones have this. Or even just stopping the phone from automatically trying to configure data and start using boatloads of it. Last time I put a sim card in this is exactly what it did.

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