Found sprint iphone 4s, can I use it?

With my luck, I found an iphone 4s at a bus stop today. It was inside a broken umbrella. When I brought it home and charged it, it was in recovery mode, so I had no choice but to restore it. The phone has a number and is connected to the sprint network, but doesn't send texts make calls etc, and I haven't received a call from anyone claiming it. Since the phone was restored, will I be able to use it as my own if I buy a plan from sprint?

Added (1). And If I currently can't, what can I do in order to be able to use it with sprint?

Added (2). I didn't have any way to return the phone, it was in recovery mode when I found it.

Added (3). Also turns out, the phone has a bad esn. So if i can't use it with sprint can I use it with another carrier?

Here what might have happened. Usually when people lose their phone, They call network provider and lock I mean master lock the phone which you won't be able to make any call or any sort of communication. Basically useless. But if it was me I would've returned the phone in the first place. To me finders are not always the keepers.

The phone has bad ESN since it's reported lost / stolen. So you can't use it on Sprint but can use on other CDMA carriers if the phone's flashed to those carriers. You can mail this person (arghyle@rocketmail.com) who can help you with your problem.

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