8.10 AT commands summary
As a conclusion table below shows most common and useful AT commands.
For more AT commands refer to [1].
Action Syntax Response Comments
Echo enable ATE1 OK Typed text is seen.
Echo disable ATE0 OK Typed text is not seen.
Voice call ATD<phoneNo>; OK Call initiated.
Remember of ';' NO CARRIER/BUSY/NO
ANSWER
Connection failure.
+CME ERROR: <err> General error*
OPERATION NOT
ALLOWED
Security reason (such as SIM
card not inserted)
UNKNOWN CALLING
ERROR
Unknown reason
Hung up call ATH NO CARRIER Connection is hanged up.
Receiving call ATA OK Call is answered.
Communication
loss
NO CARRIER
Enter PIN code AT+CPIN=[<puk>
or <pin>],
[<newpin>]
OK Set PIN or PUK or new PIN
code.*
+CME ERROR: <err> General error*
Check PIN code
status
AT+CPIN? +CPIN: <code>
OK
Returns status of PIN.
e.g. READY or SIM PIN
+CME ERROR: <err> General error*
*Refer to [1].
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