Blackberry Messenger/Data plan

[MaMMickey]

Do you have to have the internet service/data plan in order to have/use the blackberry messenger?

[NickfromIL]

you have to have a BlackBerry specific data plan:

What do I need a Data Plan for? - BlackBerryFAQ (http://www.blackberryfaq.com/index.php/What_do_I_need_a_Data_Plan_for%3F)