http://www.viber.com/
http://lifehacker.com/5706423/viber-makes-free-iphone-calls-over-3g-and-wi+fi
https://addons.mozilla.org/en-US/firefox/addon/disconnect/
When you use Viber, your phone calls and text messages (sms) to any other Viber users are free! The sound quality is also much better than a regular call.
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