Originally Posted by jeremyckitching
The BlackBerry Messenger uses the BlackBerry data plan, so if you have one there should be no extra charges. In fact, I don't believe BlackBerry Messenger works without the BlackBerry data plan.
You are correct sir.... BBMessenger will NOT work without a data plan and BBMessenger IS included in the data package....
There should be NO additional charges if the OP is on a UNLIMITED data plan...