Talkonaut is freely available, VoIP enabled, Google Talk like application for your mobile phone. Talkonaut is available for three different mobile platforms: Symbian S60, Windows Mobile 5/6 and J2ME with MIDP-2.0. Talkonaut supports Jabber, Google Talk, ICQ, MSN, AIM and Yahoo networks for chatting and voice calling.

http://www.talkonaut.com/