Cell Phone Help????????????

Okay, so my 7-year-old brother ''accidentally'' dropped my Nokia down the stairs at our church. We tried charging the phone, it wouldn't charge, we replaced the battery, that didn't work, and when you shake it, you get hear something moving around inside the phone. Anyways, I didn't like the phone, but I'm wondering what to do with the ''carcass''??? Can I trade it in for a new phone, because now, I'm phone-less...