Axel - here is an interesting thing. It appears MinMoni counts sending an email (at least for me) as data usage. Testing, on only EDGE (T-Mobile) I start a Traffic Watch in MM. Then I compose a quick email to myself at work ("test" subject/body) and the Traffic Watch counted 808 bytes. (this alone is curious) To verify what I thought I grabbed the raw sent email from my work mailbox, deleted headers I knew were added later and saved it; it is 685 bytes. The remaining 123 bytes could have been network overhead in transmitting from the device to RIM, seams reasonable to me.

I find this interesting because most carrier phone plans for BlackBerry differentiate between email use and data use; for example on T-Mo you can buy unlimited email for $10, or unlimited email + unlimited data for $20 (the last time I looked). This would explain the problem a previous poster mentioned thinking his recorded data usage seemed awfully high - it (MiniMoni or the RIM API maybe?) was counting email usage as data usage.

Hmmm.