145The following list shows how to maintain your cell phonealong with precautions.• Keep your cell phone and its accessories out of the reach ofchildren.• Maintain your cell phone in dry condition and keep it withinnormal operating temperatures. Temperatures higher than 55 C(131 F) or lower than -20 C (-4 F) may damage your phone.• Do not use or store your cell phone in dusty, dirty areas.• Do not attempt to disassemble your cell phone.• Do not drop or cause severe impact to the phone.• Do not use chemical products, cleaning solvents or detergents toclean your cell phone.• If your cell phone does not work properly, contact your dealerimmediately.• Use only authorized batteries, battery chargers and accessories.Any malfunction or damage caused by the use of unauthorizedbatteries, battery chargers and accessories will void the limitedproduct warranty.• Ensure that the grounding points of the battery and batterycharger are not in direct contact with conductive objects.A ll about performance and safety144When you are unable to charge the battery:This may be the result of one of the following three cases.1. Your charger may be out of order. Contact your nearestdealer.2. You may be attempting to use the phone in overly hot/coldtemperature. Try changing the charging environment.3. Your battery may have not been connected to the chargerproperly. Check the connector.When you are unable to input data into thePhone Book:Your Phone Book memory may be full. Try deleting someentries from your Phone Book.When you are unable to select a certainfunction:You may not have subscribed to that function, or yournetwork service provider may be in an area where suchservice cannot be provided. Contact your local serviceprovider.