Can I download JustVoip or any other Voip software to my Blackberry 8800 and make international call through Voip?

My girlfriend left to Greece to her mothers’ place. I want to talk to her mobile! but it’s so expensive in our country for an international call..! Please help me to find a good voip software to call Greece free or cheap!

I have a long distance international calling service just from my home, is there a system with which I can call from my cellular to my home so I can make that international call that way?
I want to connect my cell to my house-phone, even if I have to ask somebody at home to make the first conecction.

The thing is i bought 1000 microsoft points to be able to download the software (which is 800 points). I add my dad’s credit card, i put my account information as if i would live in new york city (I live in argentina, but Argentina is not an option when you create your account) and when i click download a window opens, which says "This item isn’t available from your curren location."
Please help me, i want this really bad
Thanks
Please dont tell me to call microsoft as a solution, since im looking for other ways than contacting microsoft, because i would need to do an international call for it.
thanks in advance
Its xbox 360, what does it have to do with flashplayer?
Its xbox 360, what does it have to do with flashplayer?

I live in England and my girlfriend lives in America. Our relationship is on the edge right now because she cant afford to speak to me, whenever i call her, her parents can track it and it is an international call. How do i call her so that it is only a local call to her!? Please help!