What instant messaging apps are good for iphone and blackberry?

I recently got the iphone 5 and my girlfriend still has a blackberry, i was wondering what instant messaging apps are good for us to communicate with?
We used bbm all the time and never had any problems with it its a great app, i'd like something that's very similar!

Kik, iMessage, instamessage, Facebook Messenger

Chat on:-) https://web.samsungchaton.com/ its for blackberry & iphone:-)

I'm pretty sure that WhatsApp works between an iPhone and a Blackberry, not entirely sure though.

Samsung chaton or facebook messenger is good

WhatsApp and Kik.

IMessage is can't be received on her blackberry phone, try twitter and Facebook Messenger will be a good solution, read more from here http://iphone.pandaapp.com/

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