Facebook's WhatsApp adding voice calls after Facebook Acquisition

As reported by multiple news platforms, they announced that WhatsApp now has 330+ million daily users and 465+ million monthly users.

At the Mobile World Congress in Barcelona, Spain, Jan Koum "WhatsApp CEO" said the voice service will be free and begin rolling out to users within the next couple of months.

Media reports put WhatsApp's revenue at about $20 million in 2013.

Chief Executive Mark Zuckerberg defended the price paid for a messaging service with negligible revenue.