Talkonaut is mobile IM chat and mVoIP application.
It supports most popular networks, such as Jabber, GTalk, ICQ, MSN, AIM and Yahoo, for chatting and voice calling. Talkonaut enables free VoIP calls over GPRS/EDGE and over 3G or WIFI.
IM chat, Group chat (see presence and status)
Calling over GPRS, 3G or WIFI
Calling to GTalk, MSN, Yahoo, AIM and iChat
Traffic compression (ZLIB)
Avatars and chat history features can be disabled in Settings to reduce memory usage and traffic consumption.