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I don't really understand this concept of... an upgrade? I've asked around and people have told me that when your contract ends you can renew it and upgrade your phone or something... I don't really understand what that means though. Does that mean when I upgrade my phone I can buy a new one...

My friend just recently went back to Korea a couple of days ago, and today he called my cellphone from there and we chatted for around an hour. After our chat ended though, I began to worry about the possibility of there being an extra charge, because the call was international? My parents will...