Samsung SGH-F490 User Manual page 54

Your phone displays "No service" or "Network
error."
• When you are in areas with weak signals or poor
reception, you may lose reception. Move to
another area and try again.
• You cannot access some options without a
subscription. Contact your service provider for
more details.
You enter a number, but the call is not dialled.
• Ensure that you have touched 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.
c
• 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 the phone.
The audio quality of the call is poor.
• Ensure that you are not blocking the phone's
internal antenna.