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.Whats App Web's user interface is based on the default Android one.As of January 21, 2015, the desktop version was only available to Android, Black Berry and Windows Phone users.
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".
In June 2009, Apple launched push notifications, allowing users to be pinged when they were not using an app.
In August 2011 a beta for Nokia's non-smartphone OS Series 40 was added.
A month later support for Windows Phone was added, followed by Black Berry 10 in March 2013.