Samsung GT-I8700 User Manual page 70

Calls are being dropped
When you are in areas with weak signals or poor reception,
you may lose your connection to the network. Move to
another area and try again.
Outgoing calls are not connected
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 you are dialling.
Incoming calls are not connected
Ensure that your device is turned on.
Ensure that you have accessed the right cellular network.
Ensure that you have not set call barring for the
incoming phone number.
Others cannot hear you speaking on a call
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.
Audio quality is poor
Ensure that you are not blocking the device's internal
antenna.
When you are in areas with weak signals or poor
reception, you may lose reception. Move to another area
and try again.
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Troubleshooting