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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.
Fishman found a Russian developer on Rent ACoder.com, Igor Solomennikov, and introduced him to Koum.
Koum named the app "Whats App" to sound like "what's up".
consumer users to provide a standard cellular mobile number.
Originally users could only communicate with other users individually or in groups of individual users, but in September 2017 Whats App announced a forthcoming business platform which will enable companies to provide customer service to users at scale. in September 2007, the duo traveled to South America to take a break from work.
In June 2009, Apple launched push notifications, allowing users to be pinged when they were not using an app.
The oldest device capable of running Whats App is the Symbian-based Nokia N95 released in March 2007.
In August 2014, Whats App released an update to its Android app, adding support for Android Wear smartwatches.
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.