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Chapter 4 – Troubleshooting and Frequently Asked Questions
38 Multi-Tech Systems, Inc. MultiModem GPRS USB Wireless Modem User Guide
Situation B: The modem always returns «No carrier» when trying to
originate a call
Solutions for “no carrier” message
If the modem
returns …
Then ask … Action
no carrier
(esp. for data
communicatio
n)
Is the selected bearer type
supported by the called party?
Is the selected bearer type
supported by the network?
Type AT+CEER to view the extended error code (see
“Error Results Codes" in the AT Command guide).
Be sure that the selected bearer type is supported by
the called party.
Be sure that the selected bearer type is supported by
the network.
If no success, try bearer selection type: AT+CBST=0,0,3
Be sure SIM card is available for data/fax calls.
no carrier
(esp. for voice
communicati
on)
Be sure that the semicolon character (“;”) is typed
immediately after the phone number in the AT
command; e.g., ATD######;