A while back RIM released the new BBM 7 with BBM Voice and tons of cool new features. Sadly, not all BlackBerry users were able to use it since it was only available for OS 6 and OS 7. But not anymore, users under OS 4.5 or OS 5 can finally get the new BBM 7 update on their BlackBerry devices.
BBM 7 includes the new BBM Voice, with which you can call your BBM contacts via a Wi-Fi network for free! It also has a couple of new emoticons and other features. Make sure you download it now!