Re: Blocking non-flat rate data
No. If data is off, it's off.
I re-read your OP and see now that you are buying the international plan. Check and see if your apn is configured in TCP options. I've seen it advised for your situation to delete the apn info and disable TCP/IP to force all data to use the BlackBerry apn. That's what I would do if I were you. But it isn't 100% from what I understand.
For info, see the post by dc/dc on this wrt using a BlackBerry in Afganistan, and why he eventually dropped T-Mobile because he kept getting hit with extra data charges.
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