I have a basic Samsung Gusto flip phone and the earpiece is not working. I can make and receive phone calls fine using a headset, but without the headset, I can not hear the dial tones nor anyone calling me. I hear the power on tones and the incoming ringtone, but I can not hear the incoming telephone caller nor can I hear any of the volume or ringtone settings when I select the PLAY option. Is this a hardware problem with the earpiece or should I try resetting the phone software?