Cell Phone. I found a Samsun A-707 cell phone in a rental car. I went to return it and they did

Question

I found a Samsun A-707 cell phone in a rental car. I went to return it and they did not know who the owner was. I took it to the phone store and they could not trace it. I want to keep the phone and use it to travel overseas. I have the code to unlock the phone. But when I turn on the phone, it is asking for a password which I do not have. Is there anyway to clear everything from phone's memmory including the start up passoword ?