CalAmp 819-GPRS series User Manual page 35

To test the link between your modem and the cellular network try to call your cell phone. Type in:
ATD<phone number to call>; (for example ATD15075551234;) and press enter. This command
will perform a voice call similar to the type a standard home phone would make and if your modem
has been activated correctly your cell phone should ring and display the number of the modem.
Answer the incoming call on your cell phone and then hang-up your cell phone. If you are properly
communicating with the modem using the steps above and still cannot connect through the cellular
network, here are a few items to check:
• Call the phone number of the modem. If the phone number is not active, the cellular service
will inform you of this.
• Confirm that the IMEI on the Label matches the IMEI in the module with AT+CGSN This will
print out the IMEI of the Modem in Decimal format, ie 355632004037819. This rarely
happens, but if the numbers do not match, the wrong IMEI may be in your Account.
• Contact your cellular provider and make certain that the International Mobile Electronic
Identity (IMEI) of the modem is active in their system.
• Check the signal strength reaching the modem using the following command: AT+CSQ A
typical reply is +CSQ? 19,99. The signal strength (first number) ranges from 0 to 31, the
higher the number the better the signal.
• Issue the command: AT^SCID to verify that the SIM card is in the modem and installed
properly. The number should match the ICCID of the issued SIM card.
• Attempt to relocate the modem and/or antenna to receive a stronger signal.
NOTE: Running diagnostics from Modem Properties may not work if the computer attempts to
communicate with the modem at an improper baud rate.
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