After initial hiccups finally BlackBerry has released its BBM Messenger for iOS and Android and it is available in Play Store and Apple Store.
However currently it has got a waiting list going on, and it will be sending invites to join BBM as per availability.
If you are one of the lucky users who had registered at www.bbm.com for this messenger (I was one such user 🙂 ), you can immediately join BBM and start using it after creating your BBM id.
Here we have first few screens which you will see –
Following are the links to download it from Google Play Store and Apple Store –