WhatsApp adding voice calls to its messaging service

Facebook and WhatsApp logos are displayed on portable electronic devices on February 19, 2014 in San Francisco. Facebook Inc. announced that it will purchase smartphone-messaging app company WhatsApp Inc. for $19 billion in cash and stock. Justin Sullivan, Getty Images

WhatsApp, the popular messaging service for smartphones that's being acquired by Facebook, has announced plans to start offering a voice service.

CEO Jan Koum said the voice service will be rolled out for Android and iPhones this spring, with Blackberry and Microsoft and Nokia phones coming later.

"We are going to introduce voice in WhatsApp in the second quarter of this year," Koum said at the Mobile World Congress in Barcelona, Spain. "I think we have the best voice product out there. We use the least amount of bandwidth."

WhatsApp currently has a voice function but only in note form. This new service will be live. 

Last week, Facebook agreed to buy WhatsApp for $19 billion in a deal that is by far the biggest by the social networking company and any other done by Google, Microsoft or Apple.

Wearing a gray shirt, jeans and a black jacket, Koum quipped, "last week we added a new Facebook friend. I don't know if you guys heard."

The blockbuster deal made serious waves with those in the telecommunications industry who gathered this week in the Catalan city, but also sparked concern among users that Facebook would introduce advertising to WhatsApp.

Koum insisted that there are no designs to add "marketing" to the messaging service.

"There are no planned changes," said Koum. "Our vision and mission are aligned. We both want to make the world more connected."

Facebook is paying $12 billion in stock and $4 billion in cash for WhatsApp. Koum along with fellow founder Brian Acton and their 55 employees were also granted restricted stock worth $3 billion that will vest over four years after the deal closes.

Koum said that he didn't expect that WhatsApp's staff would grow in number very much, saying that "we want to operate as a startup."

Relatively unknown until now in the U.S., WhatsApp is popular in other countries, both in Europe and in emerging economies. The Mountain View, California, startup already has almost twice as many users as the better known short messaging service, Twitter.

WhatsApp has 465 million monthly users and 330 daily users, according to Koum. It is ad-free and costs users 99 cents a year after a first free year.

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