40 | APPENDIX C: TROUBLESHOOTING
Appendix C
Troubleshooting
SYMPTOM:
My computer ...
… does not recognize my GSM phone [modem].
… does not respond to AT commands.
… cannot place a call.
POSSIBLE REASONS
SOLUTION
Your GSM phone is turned off.
Turn on your GSM phone.
Your phone is not communicating
properly with your computer.
Turn your GSM phone off, then
turn it on again.
The data cable is loose or
detached.
Make sure you are using the right
data cable and securely fasten it.
Other software is using the COM
port.
Deactivate the software using the
COM port.
ActiveSync
and
HotSync
usually use the COM port.
Your software is set up to use a
modem other than the GSM phone.
Configure your software for the
GSM phone as its modem.
Your fax software is set to Auto
Answer and uses the COM port.
Disable the Auto Answer feature
on your fax software.
SYMPTOM:
My call fails immediately.
OR
I get a message like
CALL FAILED
on my phone.
POSSIBLE REASONS
SOLUTION
The phone battery died.
Recharge or replace the battery.
Temporary network anomaly.
Call again.
CALL FAILED
usually
disappears after a second try. If it
doesn’t, turn your phone off, then
on again. If the problem persists,
your GSM service may be down.
SYMPTOM:
I get a message like
NO NETWORK
on my phone.
POSSIBLE REASONS
SOLUTION
You left the GSM coverage area
during the call.
Raise the phone antenna. If you
still don’t get digital coverage,
return to the coverage area to call.
