WhatsApp Messenger is a cross-platform mobile messenger that replaces SMS and works through the existing internet data plan of your device. WhatsApp is available for iPhone, BlackBerry, Android, Windows Phone, Nokia Symbian60 & S40 phones.

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. WhatsApp synchronizes with the phone’s contacts, so users do not need to add every single contact.

WhatsApp Messenger seems to be the same as SMS, but it’s not. WhatsApp can be used to share photos, movies and audio with friends and to organize a groupchat. Also your textmessages are not limited to a small number of signs.

WhatsApp Inc. was founded in 2009 by Jan Koum en Brian Acton. Both worked for 20 years at Yahoo! Inc. before.

WhatsApp, a pun on “What’s Up?!”, begun with the idea to build a better SMS alternative for smartphones. In the meantime, WhatsApp has become one of the most downloaded apps ever!