Best international phone plan?

So my phone contract expires in May and I will be travelling in Europe (mostly Spain) for a few months after that so I want to a phone plan that would make that the most cost effective. I would need quite a bit of calling minutes... Part 2 is if I have limited minutes is there a workaround like google voice or if... show more So my phone contract expires in May and I will be travelling in Europe (mostly Spain) for a few months after that so I want to a phone plan that would make that the most cost effective. I would need quite a bit of calling minutes... Part 2 is if I have limited minutes is there a workaround like google voice or if the other person calls me?