WhatsApp Messenger is a cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS. 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.
mobile app -webchat function including : message and voice chat ,group create and chat .video and pic sharing for those key core moudel better if you can refer to qq webchat . we only need the android and iphone version for the first beginning ,we need application worker to have the developing solution ,we will give the ui /design .if the solution meet our needs we will sign the agreement .we will send the ui for confirmation , the payment ,then testing finally delivery the software and giving the after service for at least 5 months with money paid
In addition to basic messaging WhatsApp users can create groups, send each other unlimited images, video and audio media messages.
same function like whatsapp .
pls advis how long and how much ?