If you're not one of the 450 million people in the world who already use WhatsApp, we're here to explain how it works.
http://www.whatsapp.com/ world.
The app is clean, simple and has no ads. When you download it, contacts in your phone who also use WhatsApp will automatically appear under the "favorites" icon. You can send messages the same way you text, as well as do a few other things. Other than typical texting, here are your options when communicating with someone on WhatsApp:
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