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.
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On February 26, 2016, Whats App announced they would cease support for Black Berry (including Black Berry 10), Series 40 and Symbian S60, as well as older versions of Android (2.2), Windows Phone (7.0) and i OS (6), by the end of 2016.
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".
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.
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.Whats App, was founded in 2009 by Brian Acton and Jan Koum, both former employees of Yahoo! In January 2009, after purchasing an i Phone and realizing the potential of the app industry on the App Store, Koum started visiting his friend Alex Fishman in West San Jose where the three would discuss "...having statuses next to individual names of the people", but this was not possible without an i Phone developer.Facebook acknowledged the breach, but said the errors in their 2014 filings were "not intentional." Until 2017 Whats App positioned itself as a solution for a single party with a single smartphone to communicate with another such party, enabling small businesses to use the platform to communicate with customers, After months at beta stage, the application eventually launched in November 2009 exclusively on the App Store for the i Phone.In January 2010, support for Black Berry smartphones was added, and subsequently for Symbian OS in May 2010 and for Android OS in August 2010.Later on, it also added support for i OS, Nokia Series 40, and Nokia S60 (Symbian).