Well, in BBM version 7, RIM has added a voice calling feature that will allow BBM users to speak to each other for free when connected to Wi-Fi networks. While Similar third-party solutions like Viber exist and extend the free calling feature to cellular data connections, an integrated solution that will eventually be baked right into the BlackBerry OS offers clear advantages over third-party options. It also can be counted as an advantage for RIM's platform over Android and iOS, at least until RIM's rivals begin to roll out Similar solutions.
Voice chat feature can be used like using a simple phone call. In fact, voice chat can be working in the back ground when you're typing text, photo browsing or emailing.
BBM 7 beta is available immediately for free to users with BlackBerry device has been working on Blackberry OS 6, or higher. At BBM 7 users can view the status of BBM contacts on the top right icon, which shows one of the four status as none (no voice BBM), offline, online and voice chat.
