SIMCOM AT Commands Set

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Introduction

• SIM908 and SIM900 have the auto baudrate detect function, can support baudrate from 1200-115200, so you can use any baudrate in this range, the first data send from SIM IC will be like random error data that can be ignored.

Common AT Commands

Command	Description	Return	Result
AT+CPIN？	check sim card status	+CPIN:READY	Sim card is found
AT+CSQ	check signal quality +CSQ:30,0	30 is the quality of signal, max at 31
AT+COPS?	check card service provider	+COPS:0,0,"CHINAMOBILE" or empty	CHINAMOBILE is the service provider
AT+CGMI	Check the module maker	SIMCOM_Ltd	Made by simcom
AT+CGMM	Check the module model type	SIMCOM_SIM900A	SIM900A
AT+CGSN	Check the module IMEI, worldwide unique	869988012018905	869988012018905
AT+CNUM	Check the number of current sim card, not all kinds of card support this function	+CNUM:"","15902020353",129,7,4	phone number 15902020353
AT+ATE1	on/off AT commands return info	send either ATE0 or ATE1 -

Calling and DTMF

Command	Description	Return	Result
ATD+number	don't forget the ";" after AT commands, for example "ATD+18576608994;"	OK	-
ATA	answer the incoming phone call	OK	-
ATH	hangoff current phone call	OK	-
AT+COLP	show up the calling number	+COLP:"10086",129,"",""	-
AT+CLIP	sown up the number of incomming call	+CLIP:"15124532672",161,"",,"ailin",0，	-
AT+VTS=*	send DTMF audio. for example, when we call the service provider number and need the press number 1 for operation, you can do AT+VTS=1	-	-

SMS

Command	Description	Return	Result
AT+CNMI	Set the new message remind, for example AT+CNMI=2,1,	+CMTI:"SM",2	when set is on and message box is NOT full, message is stored at position 2
AT+CMGF	Set the module message mode, set either at PDU(0) or text mode(1)	OK	-
AT+CSCS	Set TE character set, set AT+CSCS="GSM" for english only message, or set AT+CSCS="UCS2" for other lanuage	OK	-
AT+CMGR	read message, for exmple, AT+CMGR=1 to read message at position 1	-	-
AT+CMGS	send message, send 180 bytes at GSM mode, or 70 Chinese character at UCS2 mode, AT+CMGS="18576608994"	will return ">" and then type message, then end up with hex value 1A( 0X1A, "CTRL+Z"), send 1B to cancel "ESC"	and finally return: +CMGS:156, in which 156 has meaning.
AT+CMGS (e.g. Chinese SMS)	set AT+CMGR=1; AT+CSMP=17,167,2,25; AT+CSCS="UCS2" now the message can be by Unicode, AT+CMGS="00310035003100320034003500330032003600370032" (number 15124532672)	will return ">" and then type message 00530049004D00390030003000414E2D82F1658777ED4FE153D190016D4B8BD5, end with 1A	-
AT+CMGD	delete message, to delete message at postion 1: AT+CMGD=1	OK	-
AT+CPMS	inquiry or set message storage settings	AT+CPMS? to check how many message can be stored maximally and how many message stored	：+CPMS:"SM",1,50, means support 50 sms max and 1 sms are stored now

• General read SMS steps

      AT+CMGF=1
      AT+CSCS="GSM"
      AT+CNMI=2,1 // set new message remind
      AT+CMGR=2 // read message at position 2
      AT+CMGD=2 // delete SMS at position 2

• General send SMS steps

     AT+CSCS="GSM"
     AT+CMGF=1
     AT+CMGS="18576608994"

• Send Chinese sms

    AT+CMGF=1
    AT+CSMP=17,167,2,25
    AT+CSCS="UCS2"
    AT+CMGS="00310035003100320034003500330032003600370032"