Nyx LUX User Manual page 48

 Make sure that SIM card is properly inserted in its intended spot.

Make sure that the chip in the SIM card is not damaged or the SIM
card is not scratched.
 Check the coverage of your local network service provider if you
appear to be out of coverage or have weak signal. You may opt to
move near a window.
8. Cannot make calls
 Make sure that the number you dialed is correct and the dial key has
been pressed.

Use the full national area code.

When abroad, use country-specific international access codes
9. Cannot receive calls
 Make sure that your phone is connected to a network (Check if the
network is busy or invalid).

Check the Call Diverts settings.
 Check the Incoming CallBarringsettings.
10. The caller's number is not displayed
 Contact your local network service provider as the caller might have
withheld his or her number.
11. Entries cannot be made in Phonebook.
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