From fring: 

fring gives you FREE video calls, voice calls and live chat to your fring buddies and to other friends on popular social networks: Google Talk, MSN Messenger, Yahoo!, AIM, ICQ, Twitter & SIP! Also, use fringOut to make low cost calls to any landline or mobile worldwide (from 1c a minute).


http://reg.fring.com/app/getfring.sis?m=512


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