User's Guide

Troubleshooting
48
Solutions for “no carrier” message (cont’d)
If the
modem
returns
Then ask … Action
no carrier
(esp. for
voice
communi-
cation)
Be sure that the
semicolon character (“;”)
is typed immediately
after the phone number
in the AT command. E.g.,
ATD######;
type AT+CBST=0,0,3
Configure the SIM card
for data/fax calls.
Is the received
signal strong
enough?
See “Signal Strength
Verification,”
page 35.
Is the antenna
properly
connected?
See “Antenna
Specifications,”
page 8.