NEW FEATURE: BlackBerry users will be able to make free voice calls over a Wi-Fi network using the popular BBM messaging service.
HOW IT WORKS: Users will be able to switch back and forth from a text chat to a voice call. A split-screen option will let them talk and text at the same time.
AVAILABILITY: It's currently available for BlackBerry smartphones running the BlackBerry 6 operating system or higher, with plans for BlackBerry 5 later. RIM's latest phones run the 7 operating system. The next version, BlackBerry 10, will come soon after a Jan. 30 launch event.