Magic jack call to other countries?

I read all of the "search for questions" about the magic jack. Alot of them say that you can call to anywhere in the U.S. or Canada for free. But one lady posted that she can also use it to call France. Would it work for me to call Ireland from the U.S.?
Update: Is that $9.99 an optional feature that you can add when you set up the magic-jack, does the set-up prompt you to choose, or how does that work?
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