With the use of BlackBerry Messenger, you can send instant messages to other BlackBerry users. The system also lets you set up conference calls and even share music and other media. In order to best use the system, you need to be familiar with the various signs and symbols you'll encounter both within a chat and in the BlackBerry Messenger contact list screen.
Several icons indicate the status of messages you are sending in Messenger. While a message is being sent, you will see an icon that looks like three curved lines. If you see a plain checkmark symbol while in a chat, that means the message has been sent out from your phone. If you see a "D" appear above the checkmark, that means the message has been delivered to its recipient. If you see an "R" appear above the checkmark, that means the message has been read.
The contact list screen includes several icons that indicate something new is available to you. If you see a "*" symbol inside a red circle, that indicates you have a new item. If you see a blue speech bubble with the BlackBerry dots inside it, that indicates you have a new chat available. If you see a yellow dot with a black border, that indicates you have a new message within an existing chat. To manage any of these items and make the icon go away, open the new item or the chat.
Several icons will appear when there are pending actions within Messenger. A red square with a clock-like icon inside it indicates that some action within Messenger is pending and hasn't happened yet. If you see a yellow box with a question mark inside it, that indicates you have a contact that is pending. If you see a blue circle with a question mark inside it, that tells you the BlackBerry Messenger service has a message for you that you must open.
If you see a white speech bubble with the BlackBerry symbol in blue, that indicates you have an open chat going with someone. If you see several speech bubbles laid over one another, that indicates you have an open conference call. If you see a black phone-like icon, that indicates you have a text messaging chat or contact.
If you see a musical note, that indicates you have a media file playing within a current chat. If you see a red circle with a white horizontal line, that indicates the contact you are trying to reach is busy. A yellow square with an exclamation mark in it indicates that you have set an availability notification within BlackBerry Messenger.