Its a strange thing! Whatsapp, the popular cross platform messaging app is now not available from Windows Phone Marketplace. WhatsApp released its Windows Phone a long time ago and since then they were updating the app regularly.
Recently, WhatsApp for Windows Phone added the ability to change display picture on WhatsApp even before the same functionality landed in iOS app. We don’t know the exact reason why the app is not available in the Windows Phone Marketplace right now.
Anyway, if you already have the app installed on your phone, you can continue messaging without any problems. But new users have to wait till the app again appears in the Marketplace.
Thanks to Sam for the heads up.