WhatsApp Messenger for iPhone is a free messenger app that has become THE messenger app used internationally on a range of internet-connected devices. WhatsApp allows users to communicate via written messages, voice messages, video and audio calls. Users are also able to exchange files, such as pictures, music, documents, and even videos, with their contacts. Users must have at least a 3G or WiFi connection in order to benefit from this feature.
WhatsApp allows users to customise their status, profile picture, background and ringtone. Push Notifications can also be enabled to receive messages instantly, even when you're not active on the app.