Enter PUK Your SIM card is blocked, usually as aresult of entering your PIN incorrectlyseveral times. You must enter thePUK supplied by your serviceprovider.Your phone displays “Network unavailable” or “Network error.” When you are in areas with weak signals or poor reception, you maylose reception. Move to another area and try again. You cannot access some options without a subscription. Contact yourservice provider for more details.You enter a number, but the call is not dialled. Ensure that you have pressed the Dial key: [ ]. Ensure that you have accessed the right cellular network. Ensure that you have not set call barring for the phone number.Another caller cannot reach you. Ensure that your phone is turned on. Ensure that you have accessed the right cellular network. Ensure that you have not set call barring for the phone number.Another caller cannot hear you speaking. Ensure that you are not covering the built-in microphone. Ensure that the microphone is close to your mouth. If using a headset, ensure that it is properly connected.The phone beeps and the battery icon flashes.Your battery is low. Recharge or replace the battery to continue using thephone.The audio quality of the call is poor. When you are in areas with weak signals or poor reception, you maylose reception or experience poor audio quality. Move to another areaand try again. When you are in areas with weak signals or poor reception, you maylose reception. Move to another area and try again.You select a contact to call, but the call is not dialled.