User manual

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2. Basic operation
Followings are examples of some AT commands. Please refer to the AT command
document for a full description.
Note: Issue AT+CMEE=1 to have extended error code (+CME ERROR)
Description
AT commands
Modem
Comments
response
Network
AT+CREG?
CREG=<mode>,1
Modem registered to the
registration
network
checking
CREG=<mode>,2
Registration lost,
re-registration attempt
CREG=<mode>,0
Modem not registered on the
network, no registration
attempt
Receiving
AT+CSQ
+CSQ:20,0
The first parameter has to be
signal strength
at least 15 for normal
communication
Receiving an
RING
An incoming call is waiting
incoming call
ATA
Answer the call
OK
Make a call
ATD1234567;
Don’t forget the “;” at the
end for “voice” call
OK
Communication established
CME ERROR : 11
PIN code not entered (with
+ CME = 1 mode)
CME ERROR : 3
AOC credit exceeded or a
communication is already
established
Make an
ATD 112;
Don’t forget the “;” at the
emergency call
end for “voice” call
OK
Communication
NO CARRIER
loss
Hang up
ATH
OK
Enter PIN code
AT+CPIN=1234
OK
PIN Code accepted
+CME ERROR : 16
Incorrect PIN code (with
+CME = 1 mode)
+CME ERROR : 3
PIN already entered (with
+CME = 1 mode)
Saves
AT&W
parameters in
OK
The configuration settings
non-volatile
are stored
memory