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.
In August 2011 a beta for Nokia's non-smartphone OS Series 40 was added.
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 $4 billion in cash, $12 billion in Facebook shares, and (advised by Morgan Stanley) an additional $3 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.
According to a Tech Crunch article, Zuckerberg's vision for was as follows: "The idea, he said, is to develop a group of basic internet services that would be free of charge to use – 'a 911 for the internet.' These could be a social networking service like Facebook, a messaging service, maybe search and other things like weather.
Whats App introduces a feature named Read Receipts, which alerts senders when their messages are read by recipients.
Within a week, Whats App introduces an update allowing users to disable this feature so that message recipients do not send acknowledgements.
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The Commission alleged that in 2014, when Facebook acquired the messaging app, it "falsely claimed it was technically impossible to automatically combine user information from Facebook and Whats App." However, in the summer of 2016 Whats App had begun sharing user information with its parent company, allowing information such as phone numbers to be used for targeted Facebook advertisements.