Best Cross-Platform Messaging App?

[dimanchi]

I am looking for a messaging app to replace BlackBerry messenger - and something that will work on Android, BlackBerry and iPhone. Things like Ping! and Whatsapp aren't available on Android yet. Perhaps IM+?

Because I am new to this I would appreciate feedback from people who have used or know of messaging apps that enable instant messaging between BB, iPhone and Android devices.

 

[KrispyKrink]

Meebo, it's free and supports the majority of the protocols and services.

Depending on what service your friends are on you'll chat with them fine. Except BBM, that's a closed protocol running on the BIS using device PIN#, BlackBerry only.

 

[takeshi]

You don't really need the app to be cross-platform so much as the protocol/service.