Currently it is still in development, and alpha version is available for free for public testing.
Version: 0.39 bug fix
* Fixed Yahoo add buddy, vibration on SonyEricsson UIQ3 phones, fixed MSN and AIM online buddy detection, fixed ICQ connection problems, fixed Yahoo file transfer
fring is a free mobile application that enables you to access & interact with your social networks on-the-go, make free calls and live chat with all your fring, Skype, MSN Messenger, Google Talk, ICQ, SIP, Twitter, Yahoo! and AIM friends using your handset’s internet connection rather than costly cellular airtime minutes.