You should not get any charges related to BBM whether you are in the states or not. My understanding is BBM goes through Blackberry's server from Blackberry to Blackberry and not thru T-Mo.
When I first got my BB I would get a few data charges for BBM and would call customer svc and they didn't know why I got charged, but would remove the charges. This happened for about the first 2 months, then no more charges for BBM.
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