WhatsApp

WhatsApp Messenger is a smartphone messenger available for Windows Phone and other smartphones. WhatsApp uses your 3G/EDGE or Wi-Fi (when available) to message with friends and family. Switch from SMS to WhatsApp to send and receive messages, pictures, voice messages, and video messages. First year FREE! ($0.99 USD/year after)
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We’re always excited to hear from you! If you have any feedback, questions, or concerns, please email us at:
wp-support@whatsapp.com

or follow us on twitter:
http://twitter.com/WhatsApp
@WhatsApp
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When roaming, additional carrier data charges may apply. Please contact your carrier for details.
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2.11.516:
* Various enhancements and bug fixes

2.11.504:
* Various enhancements and bug fixes

2.11.494:
* Various enhancements and bug fixes

2.11.490:
* Chat backgrounds
* Broadcast lists
* Privacy settings (settings > account > privacy)
* Media auto-download settings (settings > chat settings > media autodownload)
* Custom notification tones (Windows Phone 8 Update 3 required)
* Various enhancements and bug fixes