CHATTAZ

Chattaz Messenger is a cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS. Chattaz Messenger is available for iPhone, Android, Windows Phone and yes, those phones can all message each other! Because Chattaz 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 Chattaz users can create groups, secret chat, send each other unlimited images, documents, video and audio media messages.