WhatsApp Messenger is a smartphone messenger available for Android, BlackBerry, iPhone, Windows Phone and Nokia phones. WhatsApp uses your 3G or WiFi when available to message with friends and family. Switch from SMS to WhatsApp to send and receive messages, pictures, audio notes, and Video messages
WHY USE WHATSAPP
NO HIDDEN COST: Once you and your friends download the application, you can use it to chat as much as you want. Send a million messages a day to your friends for free WhatsApp uses your Internet connection: 3GEDGE or WiFi when available
MULTIMEDIA: Send Video, Images, and Voice notes to your friends and contacts.
NO INTERNATIONAL CHARGES: Just like there is no added cost to send an international Email there is no cost to send WhatsApp messages internationally. Chat with your friends all over the world as long as they have WhatsApp Messenger installed and avoid those pesky international SMS costs
SAY NO TO PINS AND USERNAMES: Why even bother having to remember yet another PIN or username? WhatsApp works with your phone number, just like SMS would, and integrates flawlessly with your existing phone address book.