Specifications

7.6 Basic operations
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 response
Comments
Network
registration
checking
AT+CREG? CREG=<mode>,1 Modem registered to the network
CREG=<mode>,2 Registration lost, re-registration attempt
CREG=<mode>,0
Modem not registered on the network, no
registration attempt
Receiving signal
strength
AT+CSQ +CSQ:20,0
The first parameter has to be at least 15 for
normal communication
Receiving an
incoming call
RING An incoming call is waiting
ATA OK Answer the call
Make a call ATD1234567; OK
Communication established (Don’t forget the
“;” at the end for “voice” call)
+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
emergency call
ATD 112; OK
Communication established (Don’t forget the
“;” at the end for “voice” call)
Communication
loss
NO CARRIER
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 parameters
in non-volatile
memory
AT&W OK The configuration settings are stored
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