WhatsApp is a free download for smartphones only. The program cannot be downloaded directly to a desktop or laptop computer. WhatsApp offers its services to smartphone users entirely for free for the first year of the subscription plan.
WhatsApp charges a fee for the service every year after the first. As of May 2015, the fee is $0.99 per year. All other charges are accrued depending on what kind of data plan a user has with their cellular provider. The company does not tack on any additional charges for messaging through the application.
WhatsApp is an advertisement-free service that allows users to send text, images, video and audio messages.