Do you notice that most Blackberry users cannot use Whatsapp again? This happened today (18/01/2017). This is very frustrating as no one is expecting this problem until at least June 2017 according to update on BB website.
However, all hope is not lost, if you receive message that you can no longer send chats because your Blackberry phone is not supported, there is a way to fix that for the moment. You can try a simple trick to make Whatsapp start working again on your BB10 Device.
I Can't Access WhatsApp Again on BB10, What Should I Do?
Many users can't access Whatsapp again, if you try to chat, you will get a message that 'you can't send chat because your phone is not supported".
If you are using BlackBerry, there is a simple fix to this problem, you just need to head over to "BlackBerry World" and update your WhatsApp application from there. Your WhatsApp will start working again.
If this does not fix the problem, the next thing to do is to download "Whatsapp apk". Simply type "Whatsapp apk" on your search engine, download and install it on your BlackBerry and start chatting like other Android users.
Note: for this second method to work, you will need to have the latest version of BlackBerry Operating System that supports Android apps.
Now that you have fixed the problem, you can go back to chatting with your friends and groups. But remember, try and get a new phone that supports whatsapp before they finally block you.