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The service is free, and not charged by WhatsApp. Interestingly, Koum had also revealed that the WhatsApp development team was working on ways to implement the voice calling service in poor data coverage areas, considering that many WhatsApp users in emerging markets are still on 2G networks. Koum cited several obstacles including technical issues before the service could work seamlessly. WhatsApp's CEO, Jan Koum, had in February last year announced plans to rollout the voice calling feature by the end of the year In October he revealed that the rollout would be delayed till Q1 2015. With the addition of voice calling, the app now allows voice calls over mobile data or Wi-Fi - also called VoIP or Voice over Internet Protocol. Until recently, WhatsApp only let users send text messages to their contacts alongside allowing sharing of files (including images, music or even videos). Here are the answers to all your questions about WhatsApp 's voice calling feature. The company is rolling out the new feature in phases, and it appears some will have to wait longer than others. WhatsApp, the most popular instant messaging service used worldwide, has started rolling out the voice calling feature to its users.