Calling a US number when they are overseas results in charge

So as a person who has worked for cell providers, T-Mobile isn't charging you these fees. The other country is. Essentially there is a reason when you go on line it says you have the ability to call 200 odd countries is because those are the ones that have negotiated with your cell provider for an agreed upon price usually with T-Mobile what I've seen is 3 dollars to call a number over seas and 25 cents to call from there to the U.S. 

I get the frustration but essentially if T-Mobile didn't have the agreement they are charging you for it could be way higher. Off the top of my head from playing with the web site Cuba has vastly different rates 2 dollars a call when you traveling there and I believe 6 a minute here to there.