User guide

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Descriptions and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modification.
Dct_427_01
6.3 "NO CARRIER" message
If the modem returns the message "NO CARRIER" after an attempted call (voice or data), see the table
below for the possible causes and their solutions.
Table 15 : Solutions when a message "NO CARRIER” is returned
If the modem... Check: Action
"NO CARRIER"
Is the received GSM signal strong
enough?
See § 5.5 Checking the quality of the GSM
reception signal.
Is the modem registered on the
network?
See § 5.7 Verification of modem registration on
GSM network
Is the antenna correctly
connected?
See § 5.7 Verification of modem registration on
GSM network.
"NO CARRIER"
(when attempting a
VOICE call)
Has the semi-colon (;) been
entered immediately after the
telephone number in the AT
command?
Ensure that the semi-colon (;) has been entered
immediately after the telephone number in the
AT command.
For example: ATD0123456789;
" NO CARRIER"
(when attempting a
DATA call)
Has the SIM card been configured
for data calls.
Ensure that the SIM card is allowed to make data
calls (check with your SIM card supplier)
Is the selected modulation type
supported by the called number?
Ensure that the selected modulation type is
supported by the called number.
Is the selected modulation type
supported by the network?
Ensure that the selected modulation type is
supported by the network. If not, select a
compatible modulation type with the command
AT+CBST=0,0,1 (1*)
(1*) For more information about this AT command, see the document
"ublox_AT_Commands_Manual_xxx.pdf"
If the modem returns the message "NO CARRIER", you can get the extended error code with the command
AT+CEER.
For more information about the error codes returned after having sent the command AT+CEER, see the
document "ublox_AT_Commands_Manual_xxx.pdf"