How much to sell a white iPhone 4 for?

I recently bought an iPhone 4 from a friend for 140$ I didn't realize it was with Verizon so I'm trying to sell it and buy one that's with AT&T, but not through AT&T. The iPhone is white, 8 GB, and has a cracked screen. I don't know whether to sell it for the same amount because I was looking online and they're being sold for a lot more than 140$. How much should I charge, because I have two people looking into buying it, they just need to know a price.

Sell it for 175$-200$. You could have made more if it wasn't cracked. If 2 people are looking to buy it they can bid on it for more money maybe.

Try to trade it

Wow, it astounds me as to why people want phones with cracked screens, but if I were you, I would start at $200 and negotiate--you don't know what they're willing to pay until you ask, and if one doesn't match your price, you can tell them someone else is interested. It's business, so basically it's about who wants the phone more.

If you visit http://nextworth.com you can use their price calculator to see what it is valued at. You can also sell the iPhone with NextWorth.

Punch it in on CashForBerrys.com to get an idea what.
They offer good price for used iPhones.