If anyone has experience on this matter, I would very appreciate your input

I was thinking of buying two Boost Mobile Cell Phones (unlimited calling and texting) from the U.S. so that I can use in a Foreign country like Finland, One for me and one for my friend so that only us two can stay in contact. So I was thinking that calling from a U.S. cell phone to another U.S cell phone in a Foreign country would save money. But Will that charge both cell phones for international rates and roaming charges? Has anyone else tried this method before?

Im not really sure how this would work. Boost mobile says that they have no roaming charges though. I understand that using the boost moble prepaid phone for calling from Foreign country to U.S. is considered international long distance but will the price be the same if I am calling to another Boost mobile prepaid phone in the same area?