To get started with Yahoo!7 Messenger on your BlackBerry smartphone, you will need a Yahoo!7 Messenger account and wireless access.
If the Yahoo!7 Messenger icon is already on your home screen, click on it to install the service.
If there is no Yahoo!7 Messenger icon on your home screen:
Other services available for your BlackBerry smartphone: Yahoo!7 Mail

Yahoo!7 does not charge for this service. However, network charges and other usage fees may apply. Check your price plan for details.