WhatsApp is one such mobile application that is primarily for smartphones but these days a desktop application for computers is also available. It is a free app solely created to allow free (here we mean unpaid) communication via text/call around the globe. It uses the internet to send and receive messages, audio, video and photos and can be used on iPhones, Android phones, Apple Mac Computers and Windows Computers. WhatsApp would use your 4G or WiFi connection to be able to send and receive messages and photographs which just means that you’ll have to only worry about having data to use on your phone or be somewhere with access to WiFi but you no longer have to bother about getting a big phone bill. If you do not have enough data to send a message, it simply won’t send.