WhatsApp’s voice calling feature as been hinted for a while now, it looks like the feature will be added in the next build, based on screenshots extracted by AndroidWorld.nl from app code hosted on WhatsApp’s website.
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It’s also seems likely that users will have the option to record calls and play them back. Androidworld.nl had previously hinted that WhatsApp will launch a web version as well, with clients for Windows and OSX.