I'm 16 so I don't have a lot of cash, but I have a lot of phone cards seeing as I go to boarding school and make frequent calls. When I come home, I want to have a cell phone to be able to communicate plans with the parents, but want to use the phone cards I already have. Is there a service or pre-paid system that lets you use any phone card you want and not just that specific carriers cards?

Thanks much and happy holidays.