Samsung SGH-X640 User Manual
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“Enter PUK”
• The PIN code has been entered incorrectly three
times in succession, and the phone is now blocked.
Enter the PUK supplied by your service provider.
“No service,” “Network failure,” or “Not done”
displays
• The network connection has been lost. You may be
• The network connection has been lost. You may be
in a weak signal area. Move and try again.
• You are trying to access an option for which you
have no subscription with your service provider.
Contact the service provider for further details.
You have entered a number but it was not
dialled
• Be sure that you have pressed [
• Be sure that you have pressed [
].
• Be sure you have accessed the right cellular
network.
• Be sure that you have not set an outgoing call
barring option.
Your correspondent cannot reach you
• Be sure your phone is switched on. ([
• Be sure your phone is switched on. ([
] pressed
for more than one second.)
• Be sure you are accessing the correct cellular
network.
• Be sure that you have not set an outgoing call
barring option.
Your correspondent cannot hear you speaking
• Be sure you have switched off the microphone.
• Be sure you are holding the phone close enough to
• Be sure you have switched off the microphone.
• Be sure you are holding the phone close enough to
your mouth. The microphone is located at the
bottom of the phone.
The phone starts beeping and “Battery low”
flashes on the display
•
Your battery is insufficiently charged. Recharge the
battery.
The audio quality of the call is poor
• Check the signal strength indicator on the display
• Check the signal strength indicator on the display
(
). The number of bars indicates the signal
strength from strong (
) to weak ( ).