In the press release announcing the launch of the app, BlackBerry said that WhatsApp for BlackBerry 10 uses real-time push notifications and is fully integrated into BlackBerry Contacts.
It also uses BlackBerry 10′s home screen system, showing recently received messages in the app’s minimised tile.
When you launch the app for the first time, WhatsApp can automatically scan existing phone numbers in the contact directory and extract the ones using WhatsApp. This helps customers build out their contacts list and get started right away.
WhatsApp for BlackBerry 10 and BlackBerry 4.6 and higher is available in BlackBerry World.