Hey guys, today I am writing a review on whats app.what messaging app it is.whats app has become the most popular instant messaging app, connecting more than a billion people worldwide.these peoples, who most probably includes you and me , can share instant messages and multimedia files for free, and more interestingly, can talk for free unlimited .the app works on nearly all smartphones models and is also available for computers and works on wifi, 3g and 4g network.i am also use this app.this is good app for messaging.it allows free phone calls to any whats app use.it uses your mobile number to identify you, so no need to register.good app.i also using this app.no problem with app.thanks!