Free call to Landline or Mobile

Well, I wonder how true can this be? Gizmo call claims that you can make free calls to anywhere around the world, to any landlines or mobiles. Now let me see, could it be that you are indeed making free calls but your friend on the other end has to pay to pick up the call. Is it possible? Nothing is free so Skype is still my favorite program. If you happen to have any idea how that thing works, do drop a comment, I would love to know.
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