However, some other Blackberry 10 users also reported that they are being able to use Whatsapp on their device, while some others reported that after updating their WhatsApp from BlackBerry World, they were able to use Whatsapp again.
Thereby, according to the update from Blackberry World:
If WhatsApp has stopped working on your BlackBerry 10 smartphone, you might want to give that a try. Update the app and see if that resolves the issue. If an update does not resolve this situation, then perhaps WhatsApp has finally dropped support for BlackBerry 10. In which case, it is time for you to switch to a supported smartphones like Android OS, Windows phone, iOS, iPad, and even Apple iPhone.