WhatsApp Messenger is available for iPhone, Android and Windows Phone, 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.

Whatsapp is also available for: Apple iOS, Windows Phone and Windows/Mac PCs. Learn more.