Finally after all the delays and the botched launch, The BlackBerry Messenger app has finally found it's way to both the Apple App Store and Google Play Store and yours tru;y has been able to get the app up and running.
You guys can download it for your Android from the Google Play Store, Samsung App Store (for Samsung users) or you can get the apk from here or here. iOS users can download it from the App Store.
alternatively you just get it from http://www.bbm.com.
N.B: For Android users the BBM app only works on Android 4.0 and above (ICS, Ice Cream Sandwich, Jelly Bean )