Mediaring talk

hi i just download mediaring talk software for international calls....u guys told it is free for USA...but when i enter the number and try to call it tells me insufficient balance....i hav 0.01usd by default...wht shud i do?

reply plz

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reply plz

Initially they were giving this facility to call USA./Canada free calling, and I have used it too, but now they have closed this free services i guess as even i cannot make free calls