It's only been days since Facebook's major buyout of WhatsApp, and the popular messaging application is already set to improve in a big way. The software will soon receive voice call functionality, as announced by WhatsApp CEO Jan Koum at the company's Mobile World Congress keynote.The update will roll out sometime soon for iOS and Android, with a BlackBerry and Windows Phone patch to follow. Details are scarce on how WhatsApp voice calls will work, but its safe to assume that the app will integrate your existing contacts and Facebook friends much like it does for text messages.



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