Inviting friends and family to chat with you on BlackBerry Messenger can help you expand your contacts list. BlackBerry Messenger is an instant messaging application exclusive to the BlackBerry line of smartphones. The application provides real-time communications between users. An active cellular data or Wi-Fi connection is required to use BlackBerry Messenger. You can add a contact using either a PIN or email address. The PIN is a unique ID assigned to each BlackBerry.
Press the “Menu” key on your BlackBerry smartphone and click the “Instant Messaging” icon.