Free calling within the USA and Canada is not hard to find on most cellular plans or even most landlines. But once Skype hit the stage, the world of free calling changed forever. Skype with its voice over internet protocol (VOIP) sparked a revolution for consumers, but just as much for business owners.
http://www.forbes.com/sites/tjmccue/2012/12/27/google-voice-stays-free
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