Can I sell a Sprint iPhone 4s on eBay or Amazon?

Ok so, my older sister had an 2year contract with Sprint and she had 3 lines on her plan (for her, her fiancé, and me). How the plan works is that, if a certain amount isn't paid when the bill is due, all of the phones gets cut off. Unfortunately, after being added to her plan, I paid my portion but her and her fiancé didn't. In other words, my phone have got turned off because they didn't pay their parts of the bill. After the fact of that happening I ended up getting an iPhone 4 on Sprint's Pay-As-Go, which is prepaid since I don't have any credit yet (I'm 19).

I don't have anything to do with the iPhone 4s because my sister's service status is inactive (the phones still isn't on, and probably wouldn't be on again). I heard that you can't unlock Sprint phones like you can with AT&T and T-Mobile phones, so does that mean I can't sell it like on ebay or amazon? Or is there actually a way to unlock it? If I can sell it, how do I list the phone as to where people would understand the status that the phone is in?

Yes, using amazon trde-in or selling it on ebay, however you most likely won't get top money as people may wish to change carrier by unlocking which is not allowed, therefore you are most likely better off selling it to a trding company or selling it back to apple, have a llok around on differant sites and compare prices, i suggest only siter you trust though. Check
Amazon trade-in
How others sell the phone on ebay
Mazuma mobile trade
Grainger games trade
Apple refurb trade in

Have a llok and good luck selling

It has a bad esn and is useless as a phone.
you can't unlock sprint iphones.
you might get $100 for it to be used as a ipod touch.