According to a Tech Crunch article, Zuckerberg's vision for was as follows: "The idea, he said, is to develop a group of basic internet services that would be free of charge to use – 'a 911 for the internet.' These could be a social networking service like Facebook, a messaging service, maybe search and other things like weather.

Providing a bundle of these free of charge to users will work like a gateway drug of sorts – users who may be able to afford data services and phones these days just don’t see the point of why they would pay for those data services.

Koum named the app "Whats App" to sound like "what's up".

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This would give them some context for why they are important, and that will lead them to paying for more services like this – or so the hope goes." Just three days after announcing that Whats App had been purchased by Facebook, Koum said they were working to introduce voice calls in the coming months.

He also advanced that new mobile phones would be sold in Germany with the Whats App brand, as their main goal was to be in all smartphones. On January 18, 2016, Whats App's founder Jan Koum announced that the service would no longer charge their users a $1 annual subscription fee in an effort to remove a barrier faced by some users who do not have a credit card to pay for the service.

The client was created by Whats App Inc., based in Mountain View, California, which was acquired by Facebook in February 2014 for approximately US$19.3 billion. in September 2007, the duo traveled to South America as a break from work.

Whats App, was incorporated in 2009 by Brian Acton and Jan Koum, both former employees of Yahoo! For the rest of the following years Koum relied on his $400,000 savings from Yahoo! In January 2009, after purchasing an i Phone and realizing that the App Store would soon create an industry of apps, Koum started visiting his friend Alex Fishman in West San Jose where the three would discuss "...

After months at beta stage, the application eventually launched in November 2009 exclusively on the App Store for the i Phone.

Koum then hired a friend who lived in Los Angeles, Chris Peiffer, to develop the Black Berry version, which arrived two months later.

In June 2009, Apple launched push notifications, allowing users to be pinged when they were not using an app.

Koum changed Whats App so that when a user's status is changed, everyone in the user's network would be notified.

Within a week, Whats App introduces an update allowing users to disable this feature so that message recipients do not send acknowledgements.