TO CHECK THE MODEM:
AT
OK
TO CHANGE SMS SENDING MODE:
AT+CMGF=1
OK
TO SEND NEW SMS:
AT+CMGS="MOBILE NO." <MESSAGE {CTRL+Z}
PREFERRED SMS MESSAGE STORAGE:
AT+CPMS=? +CPMS: ("SM"),("SM"),("SM") OK AT+CPMS? +CPMS: "SM",19,30,"SM",19,30,"SM",19,30
TO MAKE A VOICE CALL:
ATD9876543210;
TO REDIAL LAST NO:
ATDL
TO RECEIVE INCOMING CALL:
ATA
TO HANGUP OR DISCONNECT A CALL:
ATH
TO SET A PARTICULAR BAUDRATE:
AT+IPR=? {To view the baud rate values}
AT+IPR=0 {To set the modem to autobauding mode}
OPERATOR SELECTION:
AT+COPS=? OK AT+COPS? +COPS: 0,0,"AirTel" OK
AT+CRC SET CELLULAR RESULT CODES FOR INCOMING CALL INDICATION:
AT+CRC=? +CRC: (0-1) OK AT+CRC? +CRC: 0 OK AT+CRC=1 OK +CRING: VOICE
READ OPERATOR NAMES.
AT+COPN=? OK AT+COPN +COPN: "472001","DHIMOBILE" +COPN: "60500 +COPN: "502012","maxis mobile" +COPN: +COPN: "502013","TMTOUCH" +COPN +COPN: "502016","DiGi" +COPN: "502017","TIMECel"" +COPN: "502019","CELCOM GSM"
GPRS COMMANDS:
Command Description
AT+CGATT ATTACH/DETACH FROM GPRS SERVICE AT+CGDCONT DEFINE PDP CONTEXT AT+CGQMIN QUALITY OF SERVICE PROFILE (MINIMUM ACCEPTABLE) AT+CGQREQ QUALITY OF SERVICE PROFILE (REQUESTED) AT+CGACT PDP CONTEXT ACTIVATE OR DEACTIVATE AT+CGDATA ENTER DATA STATE AT+CGPADDR SHOW PDP ADDRESS AT+CGCLASS GPRS MOBILE STATION CLASS AT+CGEREP CONTROL UNSOLICITED GPRS EVENT REPORTING AT+CGREG NETWORK REGISTRATION STATUS AT+CGSMS SELECT SERVICE FOR MO SMS MESSAGES AT+CGCOUNT GPRS PACKET COUNTERS
https://www.pantechsolutions.net/wireless-boards/sim900a-gsm-modem
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