Quick heads-up, Today WhatsApp for Symbian updated to v2.2.21. The updated Symbian client now supports Multimedia, users can now send each other unlimited images, video and audio media messages.

WhatsApp Messenger is a smartphone messaging app which allows you to exchange messages with your friends and contacts without having to pay for SMS. WhatsApp Messenger is cross platform and available for iPhone, BlackBerry, Android and Nokia (beta) and yes, those phones can all message each other! To send and receive messages, WhatsApp utilizes your existing smartphone internet data plan: 3G/EDGE (or Wi-Fi when available).

Compatibility :

Supports Nokia S60 3rd, 5th edition and Symbian^3 Smartphones.

Get the app from  Whatsapp.com!

Note:- WhatsApp is giving its service free for one year to this new Beta release for Symbian devices. During, or after free trial period you can purchase service for $1.99 USD/year at http://www.whatsapp.com/.