BBM allows Blackbbery users to communicate with other blackberry users. Chatting via instant messages, broadcast status, send and receive files, and many more.
You can download BBM on appworld or www.blackberry.com/messenger via web browser. Once installled, locate the Blackberry messenger icon (sometimes icon appear on Instant Messaging folder). Start BBM anda you can use it right away. Set your own status (profiles), invite a friend contact, spawn chat session and many more.