BlackBerry users will be able to make free voice calls over a Wi-Fi network using the popular BBM messaging service.
Research In Motion Ltd. announced Wednesday that it’s adding the feature to BBM. 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.
The new feature is a free update for existing customers and comes months before RIM introduces its new BlackBerry 10 smartphones, which are
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