As of January 1st 2018, WhatsApp for BlackBerry 10 devices (as well as older devices running BB OS 7)is no longer supported.
WhatsApp Messenger for BlackBerry is a smartphone messenger that works between users of different phone systems and international carriers. With a simple-to-use interface, you can also create a group chat with several contacts. If you are offline, the application records your messages, so that you can read them later.
You are also able to send and receive multimedia items, including videos, images, and voice notes. Since WhatsApp Messenger operates like an SMS exchange and uses phone numbers from the user's address book, it needs neither pins nor usernames.
The application also enables you to block contacts, share your location, manage e-mail history, personalize notification sounds, and much more.