How much would I get for trading in an iPhone 3g at gamestop?

I'm a pro rewards member card and just wanted to know how much I'd get for trading it in. My ideal goal is to trade it in a buy a 3GS with the store credit and pay the difference.

You would not get much. You would have better luck selling it and buying one on craigslist for cheaper

It all depends if gamestop would even buy it they are very picky if their is even a Little scratch on it they might not even buy it from you.
if they did you want get a lot of money from gamestop
you would be better of selling it on a private party sell you will get top doller that way

not shure what size of phone gb
for the 16 gb In-store trade credit: for like new
$26.50
In-store cash value:
$21.00
to poor
In-store trade credit:
$12.75
In-store cash value:
10
for poor
for an 8 gb
for the poor
$11.50 credit
In-store cash value:
$9.00
8 gb like new
24 store credit
19 cash