Almost all the smartphone users will be familiar with WhatsApp, the perfect replacement for your standard sms, but completely free if you have a working internet connection. Well, now WhatsApp is also available for Windows Phone 7.5 Mango, though WP 7.5 Mango still isn’t officially released but some ROMS leaked for some specific handsets.

For short, WhatsApp is cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS.
According to the official site of WhatsApp Messenger
WhatsApp Messenger is a cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS. WhatsApp Messenger is available for iPhone, BlackBerry, Android and Nokia and yes, those phones can all message each other! Because WhatsApp Messenger uses the same internet data plan that you use for email and web browsing, there is no cost to message and stay in touch with your friends.
In addition to basic messaging iPhone, Android, Nokia and BlackBerry WhatsApp Messenger users can send each other unlimited images, video and audio media messages
WhatsApp Messenger was previously available for iPhone, BlackBerry, Android and Nokia, but now it is also available for Windows Phone 7.5 Mango.
This version is the same allowing users to group chat, push notifications support, send and receive free texts and media messages such as sending photos, video and audio.

Looks like the developers of this app could not wait for the official version of Windows Phone 7.5 Mango, so they released it today on Window’s Phone 7 marketplace.
You can download Whatsapp for Windows Phone 7.5 at Zune Marketplace.
Download now, so you can enjoy free messaging via your Wi-fi connection.
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