WhatsApp Messenger is the most convenient way of quickly sending messages on your smartphone to any contact or friend on your contacts list who also have the app installed.
Currently, WhatsApp is compatible with any mobile operating systems on the market: Android, iOS, Symbian and Windows Phone. So this basically means you’ll be able to use WhatsApp to communicate with any friend, regardless of which type of smartphone they have.
Requires iOS 6.0 or later. Compatible with iPhone.