How much would GameStop give me for this?

I have a brand new iPhone 4S 16gb no scratches no cracks-BRAND NEW.
How much would GameStop give me for this
Also if its to little where can I sell I for more?

you will not get a lot for that jst look for other places but not gamestop

Probably about 1/10 of what it's actually worth. Just sell it on Ebay or Craigslist.