i do apologise if this topic has already been covered, but if not...
here are a few apps available on blackberry which i have found to be just as good as bbm ( while waiting for gg to implement the bb servers)
there are 3 to chose from ( maybe more)
1st: Live Profile, easy to use free app for blackberry,iphone and android,
for blackberrys go to: http://www.liveprofile.com/get ( on your phone)
2nd: Ping Chat, free text,picture and video messaging app again for blackberry,iphone and android,
for blackberrys go to: the app world and type in ping chat.
3rd: WhatsApp, send pictures,video, text and audio. and now with group chat. again for blackberry,iphone and android,
for blackberrys go to: blackberry app world and type in whatsapp
hope this helps people x
I love whatsapp, its helped me keep in contact with people that i never used to. It uses your contacts to find other users of whatsapp which are your friends so its great and free (depending on how long you use it)