Nokia 9210 User Manual page 241

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Try charging the communicator. If you see the battery level indicator on the phone
but the phone does not work, contact your local Nokia dealer.
Check the signal strength indicator: you might be outside the network service area.
Make sure that the telephone service is activated for your SIM card.
Check if there is an error message on the display after switching on. If so, contact
your local dealer.
Check that the SIM card is correctly installed, see the Getting started guide.
4. Communicator interface does not activate or applications stop responding
Close the cover and open it again. If this does not help, close the cover and remove
the battery. Replace the battery and open the cover again. Wait while the
communicator performs a self-test and starts.
Try charging the communicator.
If there is still no response, remove all temporary files as follows:
1 Disconnect the charger and remove the battery to restart the communicator.
2 Insert the battery and open the cover.
3 When you see the Nokia 9210 Communicator Welcome screen, immediately
press and hold keys Ctrl+Shift+I. The I key should be pressed last.
4 Temporary files are deleted. This resets the settings you have made in some of
the applications, but does not affect system settings such as Internet Access
Point settings. All other applications and files stay intact.
If the procedures described above do not help, as a last resort before contacting
your local dealer you can try formatting the internal memory of the communicator.
Note that formatting the memory removes all items except the standard
applications that have been installed on ROM memory in the factory! If you