WhatsApp Messenger

WhatsApp messenger is a smartphone to smartphone messenger currently available for iPhone and BlackBerry. The application utilizes push notifications to instantly get messages from friends, colleagues and family. Switch from SMS to WhatsApp to send and receive messages, pictures, audio notes, and video messages at no cost. All features are included in our base price without the need for extra in-application purchases.

Get it here: http://itunes.apple.com/us/app/whatsapp-messenger/id310633997?mt=8