First call your phone company to make sure it is reported and no one uses it. If you have insurance on it you can get a replacement by contacting the company you have the insurance through. If you don't know the company, your provider can tell you. If you don't have insurance on the phone and you have a phone contract, you are still under contract to pay for the service and you will have to purchase a new phone. You can get a discount of a used one from the provider or online if you have a compatible SIM card.