Can an AT&T iPhone 4S be switched to a different company?

Monday I found an AT&T iPhone 4S. I tried to get ahold of somebody that may of owned the phone, but had no luck. The phone was left on with minutes up till today. I was wondering if I could switch the phone over to a different company and use it as my own, or if it is just useful as an iPod now. I just wasn't sure because it is a contract phone and because it is technically not mine.

If its reported lost or stolen it will be blacklisted and useless as a phone.
it can be use as a ipod touch.
if you need a new iphone, email me i have a few for sale or trade.

Don't thin k so

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