According to WhatsApp’s Neeraj Arora, the world’s most popular mobile IM clients, WhatsApp, is coming to BlackBerry 10 operating system in March. 
Interestingly, it was non-BlackBerry users who lapped up WhatsApp as an alternative to BlackBerry Messenger, which still remains exclusive to BlackBerry operating system. However, WhatsApp’s popularity ensured even BlackBerry users started using the service to send messages to their non-BlackBerry using contacts.
WhatsApp is currently available for older BlackBerry smartphones but is yet to be launched on BB10. It seems we won’t have to wait for much longer. 
But till the official Whatsapp is out you can try the Open WhatsApp for free :
To download click here
More on BlackBerry 10:
Full Review of the BlackBerry Z10: Read Here
10 things about BlackBerry 10: Read Here
Social Media Evangelist | Gadget Guru | Model | Photographer | Ex- BlackBerry Boy - Now iOS | WP8 | Droid. Founder and Chief at ‘The Unbiased Blog’. I breathe in WiFi zone, prefer LTE over LIT. Ex MSFT, MCP, A+ and coder. I like news to be served to me on twitter.