It is a paid download that is available for i - Phone, Android, Black - Berry, Windows Phone, Nokia S60 and Nokia S40.
Instant messaging differs from ordinary e-mail in the immediacy of the message exchange and also makes a continued exchange simpler than sending e-mail back and forth. A main reason Whats - App chose Facebook over Google is because the CEOs of Facebook and Whats - App had developed a relationship while hiking together over the past few years.