Confused about calling an American mobile that is ...

My son is currently in Korea and he has Skpe on his mobile phone so he can call us. I would like to call him but I am confused about how to go about this without getting huge international fees. Do i need to have a plan or do I call the number that comes through on my phone using the Skype app? If I need a plan which one do I get? His phone is an American mobile but is physically in another country, does this matter at all? Obviously I have no idea how this works so any input anyone has would be wonderful! Thanks!!!

Hi, Huskymom, and welcome to the Community,
Before delving into features and subscriptions, have you tried downloading and installing the Skype software, and calling your son Skype-to-Skype?  Skype calls between Skype users are always free of charges.
What is Skype?  http://www.skype.com/en/what-is-skype/
Calling, seeing, messaging and sharing with others – wherever they are.
Get started
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Your Skype account and the latest downloads.
Video and voice calls to anyone else on Skype.
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Send text messages from just a few pennies (Note, you would receive reply SMS messages directly to your mobile (cell) phone.)
Get online at over two million public hotspots worldwide with Skype WiFi.
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    Hi and Welcome to the forums!
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