![background image](http://html.mh-extra.com/html/samsung/c6620/c6620_user-manual_338989053.webp)
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• You may be between service areas. You
should receive a signal when you enter a
service area.
You forgot a security, PIN, or PUK code.
If you forget or lose this or another code,
contact the seller or your service provider.
Your display shows white lines.
The display may show white lines if you have
turned the device on after a long period of
disuse or if you removed the battery without first
turning off the device. The display should
correct itself in a short time.
You enter a number, but the call is not
dialled.
• Ensure that you have pressed [
].
• Ensure that you have accessed the right
cellular network.
• Ensure that you have not set call barring for
the phone number.
You select a contact to call, but the call
is not dialled.
• Ensure that the correct number is stored in
the contact information.
• Re-enter and save the number, if necessary.
Another caller cannot hear you
speaking.
• Ensure that you are not blocking the built-in
microphone.
• Move the built-in microphone closer to your
mouth.
• If using a headset, ensure that it is properly
connected.
The sound quality of a call is poor.
• Ensure that you are not blocking internal
antenna.
• When you are in areas with weak signals,
you may lose reception. Move to another
area and try again.