Mobile messaging app WhatsApp has already stuck a dagger in many carriers' SMS revenues and now it looks to repeat the same trick for their voice calling revenues as well. Barron's writes that WhatsApp cofounder Jan Koum told Mobile World Congress in Barcelona this week that WhatsApp plans to roll out a voice calling feature sometime in the second quarter of 2014, which would pit the app not only against mobile carriers for messaging services but also against IP-based calling services such as Skype, BBM and Line.
WhatsApp reveals the next part of its plan to conquer the world