The iPhone users who want to maximize the messaging capability of their Smartphone should consider WhatsApp instant messenger. The WhatsApp instant messenger supports different mobile platform such as Android, iOS, BlackBerry, Windows Phone and other mobile platform. The WhatsApp is the cross-platform messaging application used for sending limitless text and multimedia images to the other WhatsApp user for free. This application functions just like your web browser. It runs on your mobile internet plan to share text and multimedia messages without any additional charge. The WhatsApp iPhone is available at free of cost for the first year. Then, you need to pay 0.99 USD per year.