I want to sell my white iPhone 4?

It is a white iPhone it has scratches on the corners but the phone is fine and so is the screen. I want to make money to get the iPhone 5 (100$). How much can i sell it for

If it is unlocked (Meaning you can remove the SIM card) then you could sell it for $180, if not, then you couldn't sell it, since you could get one for free with a contract, therefore nobody would buy it.

See for yourself. Best luck.
http://www.gazelle.com/

This article may be help: "Where To Sell Your iPhone 5 For the Most Money"
link: https://gizmodo.com/...1244699958
It is also work for other iPhones.
Notice: You'd better wipe your iPhone before resale for privacy protection.
I use http://www.safe-eraser.com/ to clean my iphone 4S before resale.
Because the wipe solution Apple provided is not safe. The deleted data can be recovery by software.