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WhatsApp updated its Windows Phone app by adding the voice calling feature that was rolled out to all Android, BlackBerry, and iOS users' months ago. Windows Phone 8+ users can make voice calls over mobile data or Wi-Fi also called VoIP or voice over Internet protocol. The update also brings new features such as sending audio files (which is currently available on Windows Phone 8.1) apart from the VoIP-based voice calling feature. The updated WhatsApp app for Windows Phone is now available to download.