Yahoo! Messenger Free SMS and chat on mobile with Yahoo! Messenger - it's faster, smarter and richer than before
ICQ Client ICQ Client - From now on you can stay in touch with your ICQ and Facebook contacts directly from your java-enabled mobile phones.
The easy-to-use ICQ application for Java-based (J2ME) phones offers the convenience of Instant Messaging on the go for users of popular Nokia and Sony Ericsson Java-enabled models
Flirtomatic Flirtomatic Find millions of like minded people and new friends with the Flirtomatic mobile application. It's open to everyone over the age of 18 and helps you to find and flirt with millions of real people, if that's a new best friend, someone to have a chat to or your soul mate, or all of the above, it's your choice
Valhalla Chat Valhalla Chat is an Instant Messenger for bluetooth devices.
What this means;
An instant messenger in general terms, offers (at least) typed text communication between users, just like: AIM, Microsoft messenger, Yahoo! messenger, Jabber, Skype and so on.
However, there's a big difference with Valhalla Chat and all these messaging systems