So, for $37 I can use my iphone as I would in the United States? We're going with another couple from our city. If I need to call or text them, I can do this for no extra charge other than the $37? I'm the only one of the 4 of us whose company is not paying for international plan. So, I can call or text them and it won't cost them any extra other than what their company is paying for anyway? Is that correct?