4.3 Receiving "No carrier" Message
9
Chapter 4 Troubleshooting
If the modem return a message of No carrier upon an attempted transmission of
data, or voice signals, then refer to the table below for possible causes and
solutions.
If the modem
returns
…
Then ask
Action
Is the received signal
strong enough?
Refer to paragraph 4.3 to
verify the strength of the
received signal.
Refer to paragraph
3.4 for antenna
requirements.
Is the antenna properly
connected?
No carrier
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. ATD######;
Is 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?
Is the selected bearer type
supported by the network?
No carrier (when
trying to issue a
voice communication)
No carrier (when
trying to issue a
data communication)
G
SM/GPRS
Modem User's Manual
