SIMCOM Basic AT

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Basic AT Commands


  • AT - AT test



Excute Feedback Read Feedback Write Feedback Test Feedback Description
AT+CSQ CSQ:20,0 - - - - - - signal quality, max at 31
AT+CRESET OK - - - - - - reset module
AT_CGMR - - - - - - - Check module firmware version
AT_CSUB - - - - - - - Check module version and IC type
- - - - AT+CPOWD=1 1= normal power off / 0 = emergancy power off - - reset module
- - AT+CPIN? +CPIN:READY, OK AT+CPIN="123456" enter sim password - - check if sim card present
- - AT+CREG? +CREG:0,1, OK; +CREG:0,2 not registered - - - - register network?
- - AT+COPS?
  • +COPS:0,0,"CHINAMOBILE" or empty
  • CHINAMOBILE is the service provider
- - - - check card service provider
AT+ATE1 - - - - - - - on/off AT commands return info
AT+CGMI SIMCOM_Ltd - - - - - - Check the module manufacturer
AT+CGMM SIMCOM_SIM900A - - - - - - Check the module model type
AT+CGSN 869988012018905 - - - - - - Check the module IMEI, worldwide unique
AT+CNUM +CNUM:"","15902020353",129,7,4 - - - - - - Check the number of current sim card, not all kinds of card support this function
- - AT+CPSI? - - - - - check UE system info
AT+IPR - AT+IPR? - AT+IPR=115200 - - - check baudrate, AT+IPR=0 for auto detect.
AT+GSV 1418B05SIM800C24_BT (bluetooth version) - - - - - - Check module version, vendor, name, etc
AT+CNMP - - - - - - -
  • network selection commands
  • 2:automatic, 13: GSM only, 38: LTE only, 48: Any modes but LTE
AT+CMEE - AT+CMEE? - AT+CMEE=2 - - - 1: use only error number code; 2: More verbose details of errors
AT+CFUN - AT+FCUN? - - - - -
  • Set Phone Functionality: 0=minimum Phone Functionality
  • 1= Full Phone Functionality, 4=disable RF circuits


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SIMCOM AT.jpg