Whats App 2.0 was released with a messaging component and the number of active users suddenly increased to 250,000.
Acton was still unemployed and managing another startup, and he decided to join the company.
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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.
Whats App was officially made available for PCs through a web client, under the name Whats App Web, in late January 2015 through an announcement made by Koum on his Facebook page: "Our web client is simply an extension of your phone: the web browser mirrors conversations and messages from your mobile device—this means all of your messages still live on your phone".
The Whats App user's handset must still be connected to the Internet for the browser application to function.
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.
The application runs from a mobile device though it is also accessible from desktop computers; the service uses standard cellular mobile numbers.
Koum named the app "Whats App" to sound like "what's up".
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".
having statuses next to individual names of the people", but this was not possible without an i Phone developer.
Fishman found a Russian developer on Rent ACoder.com, Igor Solomennikov, and introduced him to Koum.
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