WhatsApp is available for your BlackBerry 10 smartphone in BlackBerry World. In order to install and use WhatsApp on BlackBerry 10, you will need to have the BlackBerry 10 Software Release 10.0.10.82 or later, otherwise known as BB OS Version 10.0.10.648, for your BlackBerry device.
You can check your BB OS version in your smartphone's settings:
System Settings > About > Category : General > Software Release.
If your BB OS version is less than 10.0.10.648, you will need to wait for a software update from your mobile provider. Generally, your mobile service provider is responsible for releasing device updates for your BlackBerry 10 phone. To update manually from your smartphone's settings:
Note: Only official BlackBerry 10 Software Releases are supported. Pre-release and developer versions may be incompatible with WhatsApp.
If your BB OS is supported, but you still can't install/update WhatsApp from BlackBerry World, please try the following troubleshooting steps:
WhatsApp Beta is the experimental version of WhatsApp. This Beta version is available on BlackBerry’s Beta Zone, an application that provides BlackBerry 10 users with many Beta products designed specifically for their smartphones.
WhatsApp Beta usually contains many fixes and improvements that don’t yet exist in the current version of WhatsApp in BlackBerry World.
If you wish to install WhatsApp Beta:
WhatsApp Support Team