WhatsApp is a cross-platform mobile messaging application, which works uniformly on iPhone, BlackBerry, Android, Windows Phone and Nokia devices. The app allows users on any mobile operating system to exchange messages between them, without having to pay for SMS. WhatsApp uses the same data plan on your phone that you use for email and downloads, so it requires no extra charge to be connected to friends and family. WhatsApp is a beneficial service, which has really hampered the SMS business of the mobile network providers. Listed below are top 10 interesting things about WhatsApp, which should instigate you to install the app on your phone.