About sound profiles
You can set notification options, such as vibrate or tone, for Yahoo! Messenger for BlackBerry smartphones in the sounds application. The Yahoo! Messenger Alert item specifies how you are notified when a contact that you have set an availability notification for becomes available. The Yahoo! Messenger New Message item specifies how you are notified of incoming Yahoo! Messenger messages.
Depending on the sound profile that is set in the sounds application on your smartphone, you might not hear the audible notification that you have set for Yahoo! Messenger for BlackBerry smartphones. For more information about sounds, click the Help icon on the Home screen of your BlackBerry smartphone.