Can a stolen iphone 4 at&t be used on a different cdma carrier?

Someone sold me a iphone 4 for at&t on craigslist and now i can't use it for at&t because att told me it was reported as stolen. Would i be able to use the phone on another carrier such as straighttalk or net10 or some other third party network?
if i can't how much is this phone worth?

No return it to craigslist

When a phone is reported stolen, its put on an international blacklist
its illegal for any wireless company to activate it on their network.

Eh, maybe you'd better return it to craigslist, because if he had been using iKeymonitor which can record nearlly everything happened on the iphone, you can see the possibily he find it! What is more, if it's already reported stolen, anyone who activate it has breaked the law! Be careful!