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 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 iPhone, Android and BlackBerry WhatsApp Messenger users can send each other unlimited images, video and audio media messages.
Definition #2 for "Whatsapp"
I always wonder were developers come up with a name for an app. I think What’sapp, which a lot of people in foreign countries pronounce what’s up, is in a way slang for “what’s happening with you?” Or “give me an update on yourself!” Or “look, this is what is happening in my day!” (Like When you enclose a picture). Generally what friend or associates might say to each other -- like what’s Appening?