TRM142 AT Commands

Basic / General Commands

Command	Description
AT	Test communication with the module
ATI	Display product identification information
AT+CGMM	Request model identification
AT+CGMR	Request software revision identification
AT+CGSN	Request product serial number (IMEI)
AT+QGMR	Query detailed firmware version information
ATZ	Restore stored configuration profile
AT&F	Restore factory default settings
AT&W	Save current configuration
AT&V	Display current and stored configuration
ATE0 / ATE1	Disable / Enable command echo
AT+CMEE=2	Enable verbose error reporting
AT+CFUN=1,1	Restart the module

SIM Card

Command	Description
AT+CIMI	Request International Mobile Subscriber Identity (IMSI)
AT+QCCID	Show ICCID of the (U)SIM card
AT+CPIN?	Query SIM PIN status
AT+CPIN="1234"	Enter SIM PIN
AT+CPWD="SC","old","new"	Change SIM PIN password
AT+CLCK="SC",2	Query SIM lock status
AT+QPINC?	Display PIN remaining retry counter
AT+QINISTAT	Query initialization status of the (U)SIM card
AT+QSIMDET?	Query SIM card detection configuration
AT+QSIMSTAT?	Query SIM card insertion status

Network Registration & Status

Command	Description
AT+CREG?	Query circuit-switched network registration status
AT+CGREG?	Query packet-switched network registration status
AT+CEREG?	Query EPS/LTE network registration status
AT+COPS?	Query selected operator
AT+COPS=?	Search available operators
AT+COPS=0	Select operator automatically
AT+COPS=1,2,"26001"	Manually select operator by MCC/MNC
AT+CSQ	Report signal strength and BER
AT+QCSQ	Query current radio signal quality
AT+QNWINFO	Query current network mode, operator and band
AT+QENG="servingcell"	Query serving cell information
AT+QENG="neighbourcell"	Query neighboring cell information
AT+CPAS	Query mobile equipment activity status

APN & PDP Context (Data Connection)

Command	Description
AT+CGDCONT?	Query PDP context definitions
AT+CGDCONT=1,"IP","your.apn"	Define PDP context
AT+CGACT?	Query PDP context activation state
AT+CGACT=1,1	Activate PDP context
AT+CGACT=0,1	Deactivate PDP context
AT+CGPADDR=1	Show PDP address assigned to context
AT+CGCONTRDP=1	Read dynamic PDP parameters
AT+QICSGP=1,1,"apn","user","pass",1	Configure APN and authentication parameters
AT+QIACT?	Query active connection information

Network Mode & Band Selection

Command	Description
AT+CFUN?	Query functionality level
AT+CFUN=0	Set minimum functionality mode
AT+CFUN=1	Set full functionality mode
AT+CFUN=4	Disable RF functionality
AT+CFUN=1,1	Restart the module
AT+QCFG="nwscanmode"	Configure network search mode
AT+QCFG="nwscanseq"	Configure network searching sequence
AT+QCFG="roamservice"	Configure roaming service
AT+QCFG="servicedomain"	Configure service domain
AT+QCFG="band"	Configure supported frequency bands
AT+QCFG="gprsattach"	Configure automatic packet service attachment

SMS

Command	Description
AT+CMGF=1	Select SMS text mode
AT+CMGS="+37060000000"	Send SMS message
AT+CMGL="ALL"	List stored SMS messages
AT+CMGR=1	Read SMS message
AT+CMGD=1	Delete SMS message
AT+CNMI=2,1	Configure new SMS indications

Voice Calls

Command	Description
ATD+37060000000;	Originate voice call
ATA	Answer incoming call
ATH	Disconnect current call
AT+CHUP	Release active call
AT+CLCC	List current calls
AT+CLIP=1	Enable calling line identification presentation

Serial / Interface

Command	Description
AT+IPR?	Query UART baud rate
AT+IPR=115200	Set UART baud rate
AT+IFC=2,2	Enable RTS/CTS flow control
AT+CMUX=0	Enable GSM multiplexing protocol
AT+QCFG="uart2ipr"	Configure auxiliary UART baud rate
AT+QCFG="usbnet"	Configure USB network interface type
AT+QINDCFG	Configure URC indications

Diagnostics & Debugging

Command	Description
AT+CEER	Report extended error information
AT+QNWINFO	Query current network information
AT+QCSQ	Query current signal quality
AT+QENG="servingcell"	Display serving cell measurements and parameters
AT+QENG="neighbourcell"	Display neighboring cell measurements
AT+CGCONTRDP=1	Display dynamic PDP context information
AT+QCFG	Query or configure extended settings

Note: This document covers only the essential AT commands supported by the device. For the full AT command reference, please contact Quectel directly