Robustel GoRugged M1000 User Guide
RT_UG_M1000 Standard_v.2.0.0 20.12.2013 82 / 83
Confidential
5.5.4 Receiving “No Carrier” Message
If the modem returns a “No Carrier” message upon an attempted call (voice or data), then refer to the table below
for possible causes and solutions.
Is the received signal strong enough?
Refer to section 5.2.7 Networks -> Values
of received signal strength (RSSI)
Is the modem registered on the
network?
Refer to section 5.2.7 Networks ->
Registration
Is the antenna properly connected?
Refer to section 2.5 Connect the External
Antenna (SMA Type).
“No Carrier” (when trying to
issue a voice communication)
Is the semicolon (;) entered
immediately after the phone number
in the AT command?
Ensure that the semicolon (;) is entered
immediately after the phone number in the
AT command.
e.g. ATD123456;
“No Carrier” (when trying to
issue a data communication)
Is the SIM card configured for data /
fax calls?
Configure the SIM card for data / fax calls
(Ask your network provider if necessary).
Is the selected bearer type supported
by the called party?
Ensure that the selected bearer type is
supported by the called party.
Is the selected bearer type supported
by the network?
Ensure that the selected bearer type is
supported by the network.
If no success, try bearer select type by AT
command: AT+CBST=0,0,3
5.7 Terms and Abbreviations
Access Point Name of GPRS Service Provider Network
Conformité Européene (European Conformity)
Challenge Handshake Authentication Protocol
Decibel Relative to an Isotropic radiator
Data Communication Equipment (typically modems)
Digital Cellular System, also referred to as PCN
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