WhatsApp Messenger is available for iPhone, BlackBerry, Android, Windows Phone and Nokia and yes, those phones can all message each other!
Because WhatsApp Messenger uses the same internet data plan that you use for email and web browsing, there is no cost to message and stay in touch with your friends.
In addition to basic messaging WhatsApp users can create groups, send each other unlimited images, video and audio media messages.
It eliminates the need to worry about carrier or international charges. Apps like LINE, WeChat, Nimbuzz, Tango, KakaoTalk, and of course WhatsApp, are making a splash on mobile.
According to a recent survey, messaging through this type of software app has now exceded that through conventional SMS delivery and Nokia have now added a Whatsapp button to their product. The cost of these apps is $0.99 per annum