Last year BlackBerry Messenger (BBM) available for Android and iPhone, but that apps required Android 4.0 Version installed. But now, BBM for Ginger bread beta version appear.
If you wanna use this apps, follow this instruction.
UPDATE: download n install THIS (no Root Access Needed)Prerequisite : Root Access & Titanium Backup Installed
1. Download and install BBM apps beta,from https://db.tt/8nawBQVF
Don't forget thick to ”Unkwon source” in Setting > Applications
installation proccess, don't open the app first
2. Download this zip file https://db.tt/7NBhUdE8
then put in sdcard/titanium/ folder , extract it
3. Open Titanium Backup
Choose ”Backup/restore” Tab > find "BBM" > Restore > Data Only
Done, BBM Apps ready to use. But you need to create "BlackBerry ID"first to use this apps