How to make free cheapest international calls to reduce my call rates

if you want make free call then you can use fring in your mobile....
fring is a app for all mobile....
Download Fring On http://www.fring.com/
 what-is-fring

• Group Video chat

  See all your friends, wherever you are.
  4-way live video calling for free. It's a mobile video party.
  
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  Video chat anyone

  See and hear your friends, wherever they are. Share the fun of a live,free video call anytime, anywhere (3G,4G, WiFi...)
  
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  Call for FREE

  Talk as much as you want to any friend in the world. Avoid restrictive, expensive calling plans and move to fring's unlimited free calling.
  
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  Live Chat

  Unlimited live chat for free with friends on fring and other networks including MSN Messenger®, GoogleTalk™, AIM® & ICQ®
  No limits.
  
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  Call any regular
  phone # for cheap

  If your friends are not on fring, use fringOut™ to call them for darn cheap! fringOut calls to any regular phone number worldwide starting from 1¢/minute