Smartphone is useless without this messenger. WhatsApp is a cool messenger application that everyone is fond of. its an easy and cheap way of communicating with others. I also use this application not only for communicating with family or friends but also for my job or work oriented task. This helps me to send necessary documents within fraction of seconds. it is a very useful application. Its design is so cool that made everyone fall in love with it. Its features include video calling and voice calling, which is so amazing. You can send unlimited messages and pass on important important information quickly and almost free.