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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 Whats App support staff announce that messages were encrypted in the "latest version" of the Whats App software for i OS and Android (but not Black Berry, Windows Phone, and Symbian), without specifying the cryptographic method.
Whats App introduces a feature named Read Receipts, which alerts senders when their messages are read by recipients.
By early 2011, Whats App was one of the top 20 apps in Apple's U. 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.
Koum changed Whats App so that when a user's status is changed, everyone in the user's network would be notified.
Whats App 2.0 was released with a messaging component and the number of active users suddenly increased to 250,000.
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".
In June 2009, Apple launched push notifications, allowing users to be pinged when they were not using an app.