There are a few multinetwork IM clients for mobile phones, but JiveTalk is the one I keep coming back to on the BlackBerry Curve. It may not have the translation engine of Shape Service's more established IM+ All-in-One Messenger (all platforms), but it does have the emoticons, some file-sharing, and a more generous trial period than both IM+ All-in-One-Messenger and Mundu IM (all platforms), another excellent choice. JiveTalk costs about $30 for a lifetime license and is free for iPhone users.
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