I hate to be the one to point out the obvious, but this is not T-Mobile Customer Service. Get off the computer and call T-Mobile Customer Service for answers to this and any other questions relating to your T-Mobile contract.
I'm having computer trouble. And to head off the inevitable "if your computer is broken how are you asking this question" comments ~ I'm using my wife's computer. It works fine.
My computer is not working so fine. I have a 2 year old Gateway GM5260 desktop purchased from Best Buy with Windows...
Perhaps if you take the games to the Game Stop store and ask the nice clerk who works there how much they'll give you for them, they would tell you. Game Stops are everywhere. I live in a small town in Texas and we have two of them.