You have entered a number but it was not dialled, Your correspondent cannot reach you, Your correspondent cannot hear you speaking – Samsung SGH-A308 User Manual
Page 63: The audio quality of the call is poor

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“No service”, “Network failure” or “Not done” is
displayed
• The network connection was lost. You may be in a
weak signal area (in a tunnel or surrounded by
buildings). Move and try again.
• You are trying to access an option for which you have
not taken out a subscription with your service
provider. Contact the service provider for further
details.
You have entered a number but it was not dialled
• Have you pressed the
key?
• Are you accessing the right cellular network?
• You may have set an outgoing call barring option.
Your correspondent cannot reach you
• Is your phone switched on (
pressed for more
than one second)?
• Are you accessing the right cellular network?
• You may have set an incoming call barring option.
Your correspondent cannot hear you speaking
• Have you switched off the microphone?
• Are you holding the phone close enough to your
mouth? The microphone is located at the bottom of
the phone.
The phone starts beeping and “**Warning** Low
Battery” flashes in the display
• The battery is insufficiently charged. Replace the
battery and recharge it.
The audio quality of the call is poor
• Check the signal strength indicator in the display
(
); the number of bars after it indicates the
signal strength from strong (
) to weak (
).
• Try moving the phone slightly or moving closer to a
window if you are in a building.
No number is dialled when you recall a phonebook
entry
• Check that the numbers have been stored correctly,
by using the Phonebook Search feature.
• Re-store the number, if necessary.
If the above guidelines do not enable you to solve the
problem, take a note of:
• The model and serial numbers of your phone
• Your warranty details
• A clear description of the problem
Then contact your local dealer or SAMSUNG
after-sales service.