Acton was still unemployed and managing another startup, and he decided to join the company.After months at beta stage, the application eventually launched in November 2009 exclusively on the App Store for the i Phone.The application runs from a mobile device though it is also accessible from desktop computers; the service uses standard cellular mobile numbers.
Within a week, Whats App introduces an update allowing users to disable this feature so that message recipients do not send acknowledgements.
Diego Dzodan, a Facebook executive, is arrested by Brazilian federal police after Facebook fails to turn over information from his Whats App messaging account into a judge's request for a drug trafficking investigation.
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.
Koum then hired a friend who lived in Los Angeles, Chris Peiffer, to develop the Black Berry version, which arrived two months later.
Whats App was switched from a free to paid service to avoid growing too fast, mainly because the primary cost was sending verification texts to users.
In December 2009, the ability to send photos was added to Whats App for the i Phone. Facebook, which was advised by Allen & Co, paid billion in cash, billion in Facebook shares, and (advised by Morgan Stanley) an additional billion in restricted stock units granted to Whats App's founders, Koum and Acton.
By early 2011, Whats App was one of the top 20 apps in Apple's U. At a keynote presentation at the Mobile World Congress in Barcelona in February 2014, Facebook CEO Mark Zuckerberg said that Facebook's acquisition of Whats App was closely related to the vision.
On February 24, 2009, he incorporated Whats App Inc. However, because early versions of Whats App often crashed or got stuck at a particular point, Koum felt like giving up and looking for a new job, upon which Acton encouraged him to wait for a "few more months".