UPDATE 20100715 1135: WhatsApp BETA for Nokia is for S60 3rd and 5th Edition. FREE for 90 days and after that is chargeable at US$1.99 per year.
WhatsAPP is an IM app which allows you to communicate across iPhone and Blackberry users. The beauty of WhatsApp is that it works in SMS-like manner and it utilises notification services which is more efficient compared to most IM apps.
We have been waiting for it to extend to Android and Symbian which will make it the universal IM for all mainstream devices. Today, it was revealed that the BETA version for Symbian is now available for download.
Download it now at http://www.whatsapp.com/nokia/