WhatsApp is available for free download on the iTunes App Store for Apple devices, the Microsoft Store for Windows devices and Google Play for Android devices. WhatsApp is also available for Blackberry, Nokia S40 and Nokia Symbian on the downloads page of the official WhatsApp website. The program cannot be downloaded directly to a desktop or laptop computer.
WhatsApp allows users from all compatible platforms to message and interact with one another regardless of another user's device. WhatsApp sends and receives messages over Wi-Fi or mobile wireless data networks. A paid 3G or 4G data plan from a wireless provider is necessary to use WhatsApp outside of Wi-Fi coverage, since WhatsApp does not use traditional methods to send SMS and MMS messages to other users.
WhatsApp is an advertisement-free service that allows users to send text, images, video and audio messages.