How to sell my iphone to gamestop?

My older brother gave me an iphone 4s 16 gb that he found, I haven't used it for a long time, what do I need to sale it to gamestop? What do they ask of it? Can I get in trouble if they see its a found iphone?

Don't sell it there they are not giving a lot of money for it
Sell it on craighlist

I don't think gamestop sells iphones lmao (if I'm wrong then don't I feel stupid)
but still i doubt it and they probably won't be able to find out
you're probably better off selling it online or to kids in your school if you can get them to pay

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