SMT-W6100 User Guide141Voices echo during a call.Press the Volume key and adjust the volume or move to another area.The indicator appears on screen and calls cannot be made.- Your phone may not be registered on the system. Use the phone after registration.- Move to an area where service can be provided.- If the phone does not work despite the above measures, contact the Samsung Electronicsservice center.Calls are disconnected frequently.- Move to another area since the frequency is unstable.- If calls are still disconnected frequently, contact the Samsung Electronics service center.The phone operates abnormally or does not operate at all.Take the battery out and insert it again, and turn the phone on again. If the problem continues,contact the Samsung Electronics service center.