I'm gladly announcing that there's a new Blackberry Storm freeware available, called Blinko. Basically Blinko is a chatting-for-free software, with several other cool features.
The freeware is called sYman, which is made specially for Symbian handsets of Nokia. It's a Yahoo Messenger Client that is free, fast and simple. Therefore, you can chat with your friends for free (except for the internet connection fee, of course).