Samsung CorbyPRO User Manual page 85

The phone prompts you to insert the SIM card.
Ensure that the SIM or USIM card is installed
correctly.
Your phone displays "Service unavailable" or
"Network connection 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 dialed.
• 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.
b
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.
].