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 everyone. Features of WhatsApp includes; Group conversations, Voice Messaging, Image and Video sharing and more!
. It is free
. Message anywhere, anytime
. Can be used on different devices
. You can easily import your facebook and phone contacts
. Allows you to reach large numbers simply
. There is a $0.99 charge after you use the app for a year.