I use OctroTalk recently, and I like it. It is compatible with Google Talk (Jabber), MSN, AIM, ICQ and Yahoo chat protocols. It is cross platform – running on Symbian 3rd Edition, Windows Mobile and WM Smartphone as well as the Desktop version of Windows. It also has a useful file sharing side – you can use it to access shared folders on PCs running the Windows client and there is some kind of P2P file sharing built in to boot. The downside is… well, it’s yet another IM/VOIP app. Fring is probably a better bet for most users, particularly if you need Skype access for your
Wireless Voip Business Mobile Phones.