As at the time of publishing this post, there is no official Instagram app for Blackberry but if your BB is running on Blackberry OS 10.2.1, you can now install Instagram on your BB because the OS now allows BB 10 phones users to install Android applications right on their phones.
To install Android application on your BB 10, you will need the apk file of the Android application. Hence, to install Instagram on your BB. So, download latest Instagram apk file here.
Save the file to your Blackberry, tap the file to open, then tap Install. Ensure you “accept’ the terms.
Once installed, tap Open > login (or sign up) and start gramming!
Remember, you’ll need to be running OS 10.2.1 for this to work.