Outgoing calls are not connected, Incoming calls are not connected, Others cannot hear you speaking on a call – Samsung GALAXY GT-S5690 User Manual
Page 122: Audio quality is poor, The device beeps and the battery icon flashes, Ensure that you have pressed the dial key, Number you are dialling, Ensure that your device is turned on, Phone number, Ensure that the microphone is close to your mouth
Troubleshooting
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Outgoing calls are not connected
Ensure that you have pressed the Dial key.
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Ensure that you have accessed the right cellular network.
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Ensure that you have not set call barring for the phone
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number you are dialling.
Incoming calls are not connected
Ensure that your device is turned on.
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Ensure that you have accessed the right cellular network.
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Ensure that you have not set call barring for the incoming
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phone number.
Others cannot hear you speaking on a call
Ensure that you are not covering the built-in microphone.
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Ensure that the microphone is close to your mouth.
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If using a headset, ensure that it is properly connected.
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Audio quality is poor
Ensure that you are not blocking the device’s internal
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antenna.
When you are in areas with weak signals or poor reception,
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you may lose reception. Move to another area and try
again.
When dialling from contacts, the call is not connected
Ensure that the correct number is stored in the contact list.
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Re-enter and save the number, if necessary.
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Ensure that you have not set call barring for the contact’s
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phone number.
The device beeps and the battery icon flashes
Your battery is low. Recharge or replace the battery to
continue using the device.