Hello all, now w3bsoftware will share an application to free chat and calls. its a Nimbuzz. Nimbuzz lets you call, chat and interact with your friends on all popular instant messaging and social networks.
Chat and interact with all your friends from one place: Windows Live Messenger (MSN), Yahoo, ICQ, AIM, Google Talk, Facebook, MySpace, and more.  One secure login for all communities!
Use Nimbuzz to call your friends on Windows Live Messenger, Yahoo, Gtalk, Nimbuzz and more, no matter where they are! Use Nimbuzz to make conference calls with your buddies on different communities.
Use Nimbuzz to share files such as photos, music and video with your buddies across all supported comunities.Buddy offline? Send them a Nimbuzz Buzz to let them know you want to get in contact.


Lets Enjoy chat n call your friends..:D


Source : http://downloads.pcauthority.com.au/article/435-nimbuzz