You might already knew that RIM had a big announcement on the recent days relating with its exclusive BlackBerry Messenger Service. Yes, the RIM has giving it exclusivity of the BBM to others platform. You will be able to use the BBM in cross platform device, at this case the Android platform and iOS.
This means, whenever the BBM available for both of those platforms, you can communicate with your friends or colleague via BlackBerry Messenger from Android device and iOS device. This including the most popular Samsung Galaxy S series, or Motorola Droid, or iPhone and iPad would be able to use the BBM.