Fibocom FM350-GL AT Commands Reference
Complete list of AT commands from Fibocom FM350 AT Commands User Manual V2.10 (2023).
Source: Fibocom_FM350_AT Commands User Manual_V2.10.pdf in this repo.
Tip: To get the modem’s own list at runtime, use AT+CLAC (List of All Available AT Commands).
Sending AT commands (FM350-GL)
Use /dev/ttyUSB1 when modem is in USB Mode 40 (0e8d:7126). In Mode 41, AT commands do not work.
If AT commands get no response: run /usr/local/bin/diag-at-port.sh on the device to check serial ports, permissions, and which port responds to AT. See WEBGUI.md → Troubleshooting: No modem AT data.
1. Basic / test
| Command |
Description |
AT |
Test communication (expect OK) |
ATE0 / ATE1 |
Disable / enable command echo |
A/ |
Repeat last command |
2. Modem information (Ch. 3)
| Command |
Description |
AT+CGMI / AT+GMI |
Manufacturer ID |
AT+CGMM / AT+GMM |
Model ID |
AT+CGMR / AT+GMR |
Revision / firmware version |
AT+CGSN / AT+GSN |
IMEI (product serial number) |
AT+CIMI |
IMSI |
AT+CNUM |
MSISDN(s) (phone number) |
AT+CCID / AT+ICCID |
SIM ICCID |
AT+EID |
eSIM EID |
AT+CLAC |
List of all available AT commands |
AT+SIMTYPE |
Current SIM type |
AT+CFSN |
Factory serial number |
AT+GTGATR |
Answer to Reset (ATR) info |
AT+GTAPPVER |
sAP firmware version |
AT+GTBASELINEVER |
Baseline version |
AT+GTPKGVER |
Firmware package version |
AT+GTMCFWVER |
Firmware original version |
AT+GTCUSTPACKVER |
Operator image version |
AT+GTCFGELEMVER |
Customized image version |
AT+GTCUSTDATAVER |
Device parameters image version |
AT+GTCURCAR |
Current carrier ID and name |
AT+GTLOCKCAR |
Carrier lock mode |
AT+GTESIMCFG |
eSIM function |
3. Modem control (Ch. 4)
| Command |
Description |
AT+CFUN |
Phone functionality (e.g. reset: AT+CFUN=1,1) |
AT+GTDUALSIM |
Dual SIM switch |
AT+CMEC |
Mobile termination control mode |
AT+CMER |
Mobile termination event reporting |
AT+EFUN |
Functionality for multiple SIM |
AT+MSMPD |
SIM hot plug enable/disable |
AT+CPWROFF |
Switch off MS |
4. Call control (Ch. 5)
| Command |
Description |
ATD |
Dial (data call) |
ATH |
Hang up |
AT+CUSD |
Unstructured Supplementary Service Data (USSD) |
5. Phone book & clock (Ch. 6–7)
| Command |
Description |
AT+CPBS |
Select phone book memory |
AT+CPBR |
Read phone book entries |
AT+CPBF |
Find phone book entries |
AT+CPBW |
Write phone book entry |
AT+CCLK |
Read/set system date and time |
6. SMS (Ch. 8)
| Command |
Description |
AT+CSCS |
Character set |
AT+CSMS |
Select message service |
AT+CPMS |
Preferred message storage |
AT+CMGF |
Message format (0=PDU, 1=text) |
AT+CSCA |
SMS centre address |
AT+CSMP |
Set SMS text mode parameters |
AT+CSDH |
Show SMS text mode parameters |
AT+CNMI |
New message indications |
AT+CNMA |
New message acknowledgement |
AT+CMGL |
List messages |
AT+CMGR |
Read message |
AT+CMSS |
Send message from storage |
AT+CMGW |
Write message to storage |
AT+CMGD |
Delete message |
AT+CGSMS |
Select service for MO SMS |
AT+CMGS |
Send message |
AT+CSAS |
Save SMS settings |
AT+CRES |
Restore SMS settings |
AT+CMMS |
More messages to send |
AT+CSCB |
Select cell broadcast messages |
7. SIM / security (Ch. 10)
| Command |
Description |
AT+CPIN |
PIN management (e.g. PIN enter) |
AT+CPWD |
Change password |
AT+CLCK |
Facility lock |
AT+CSIM |
Generic SIM access (transmit) |
AT+CRSM |
Restricted SIM access |
8. Network (Ch. 11)
| Command |
Description |
AT+CSQ |
Signal quality (RSSI) |
AT+CESQ |
Extended signal quality (5G: ss_rsrq, ss_rsrp, ss_sinr) |
AT+CREG |
Network registration status (2G/3G) |
AT+CGREG |
GPRS registration |
AT+CEREG |
EPS (LTE/5G) registration |
AT+COPS |
Operator selection |
AT+CPOL |
Preferred operator list |
AT+COPN |
Operator names |
AT+CEMODE |
RAT mode (e.g. LTE/5G preference) |
AT+PACSP |
RAT priority / URC |
AT+ERAT |
RAT (radio access technology) |
AT+EPBSEH |
(RAT / band related) |
AT+EPRATL |
(RAT list) |
AT+GTACT |
Active RAT / band info |
AT+GTCCINFO |
Cell / connection info |
AT+GTCAINFO |
Carrier aggregation info |
9. GPRS / PDP context (Ch. 12) – data connection
| Command |
Description |
AT+CGDCONT |
Define PDP context (set APN, etc.) |
AT+CGATT |
Packet domain attach/detach |
AT+CGACT |
PDP context activate/deactivate |
AT+CGPADDR |
Show PDP addresses (assigned IP) |
AT+CGEQREQ |
QoS profile (requested) |
AT+CGCMOD |
PDP context modify |
AT+CGDATA |
Enter data state |
AT+CGDSCONT |
Define secondary PDP context |
AT+CGCONTRDP |
PDP context read dynamic parameters (IP, DNS, MTU) |
AT+CGSCONTRDP |
Secondary context read dynamic parameters |
AT+CGTFTRDP |
(Context read dynamic parameters) |
AT+CSCON |
Connection state (e.g. 5G NR state) |
AT+EIAAPN |
(APN / interworking) |
AT+E5GOPT |
5G option |
AT+EAPNACT |
APN activation |
AT+GTDNS |
Get/set DNS for context |
10. Hardware / platform (Ch. 13)
| Command |
Description |
AT+GTUSBMODE |
USB mode (40 = RNDIS, 41 = extended) |
AT+GTFMODE |
(Firmware / feature mode) |
AT+GTDIPCMODE |
Dual IPC mode |
AT+GTREGWRITE |
Register write (platform) |
AT+GTRXPATHEN |
Rx path enable |
AT+GTTXPWR |
Max TX power |
AT+GTSAR3DBFB |
3 dB per CC power setback (SAR) |
11. Body SAR (Ch. 14)
| Command |
Description |
AT+BODYSAREN |
Enable/disable body SAR |
AT+BODYSARMODE |
Control mode |
AT+BODYSARRULE |
Regulatory rule |
AT+BODYSARTRIGIDX |
SAR table trigger index |
AT+BODYSARON |
Trigger SAR (SW mode) |
AT+BODYSARPROFILE |
SAR table index to modify |
AT+BODYSARCFG |
Max TX power limit (antenna combination) |
AT+BODYSARVER |
SAR NVM version |
12. TA-SAR (Ch. 15)
| Command |
Description |
AT+GTTASEN |
Enable/disable TA-SAR |
AT+GTTASMODE |
Control mode |
AT+GTTASRULE |
Regulatory rule |
AT+GTTASCTRL |
TA-SAR control parameters |
AT+GTTASTRIGIDX |
SAR table trigger index |
AT+GTTASON |
Trigger TA-SAR (SW mode) |
AT+GTTASPROFILE |
SAR table index to modify |
AT+GTTASCFG |
Max TX power limit (antenna combination) |
AT+GTTASCLEAR |
Clear TA-SAR config |
AT+GTTASSTATE |
Current TA-SAR state |
AT+GTTASVER |
SAR NVM version |
AT+GTTASPLMNEN |
PLMN switch TA-SAR algorithm |
13. Tunable antenna (Ch. 16)
| Command |
Description |
AT+GTANTTUNINGEN |
Enable/disable tunable antenna |
AT+GTANTTUNEMODE |
GPO/MIPI tuning mode |
AT+GTANTCTRLMODE |
SW/HW tuning control |
AT+GTANTPROFILE |
Effective profile (SW mode) |
AT+GTANTGPOCFG |
GPO tuning values |
AT+GTANTTUNERCFG |
Tuner register value |
AT+GTANTMIPICFG |
MIPI tuning value |
14. FCC lock (Ch. 17)
| Command |
Description |
AT+GTFCCLOCKMODE |
FCC lock/unlock mode |
AT+GTFCCLOCKSTATE |
FCC lock/unlock state |
AT+GTFCCEFFSTATUS |
Current FCC status |
AT+GTFCCLOCKGEN |
Modem challenge (FCC lock) |
AT+GTFCCLOCKVER |
FCC lock verify challenge |
15. Thermal (Ch. 18)
| Command |
Description |
AT+GTTHERMAL |
Fibocom thermal management on/off |
AT+GTTHMLEN |
Actuator feature enable |
AT+GTSENRDTEMP |
Thermal sensor current |
AT+GTZONERDMAXTEMP |
Thermal zone max temperature |
AT+GTACTRDLEVEL |
Actuator current level |
AT+GTTHMLTIMER |
Thermal time interval |
AT+GTTHMLTIMES |
Thermal management running time |
AT+GTZONEWRTHD |
Write zone threshold |
AT+GTZONERDTHD |
Read zone threshold |
16. GNSS (Ch. 19)
| Command |
Description |
AT+GTGPSSWITCH |
GNSS enable/disable |
AT+GTGPSPOWER |
GNSS power control |
AT+GTGPSDELAID |
Start mode (e.g. A-GPS) |
17. Error reporting (Ch. 20)
| Command |
Description |
AT+CMEE |
Mobile equipment error report (0/1/2) |
AT+CEER |
Extended error report |
Commands used in this project
| Command |
Use |
AT |
Connectivity test |
AT+CSQ |
Signal strength (e.g. status/healthcheck) |
AT+CGDCONT=1,"IP","<APN>" |
Set APN |
AT+CGDCONT? |
Read PDP context (APN) |
AT+CGACT=1,1 |
Activate PDP context 1 |
AT+CGPADDR=1 |
Get modem IP |
AT+CGCONTRDP=1 |
Get DNS, MTU, connection params |
AT+GTUSBMODE? |
Check USB mode |
AT+GTUSBMODE=? |
List supported USB modes |
AT+GTUSBMODE=40 |
Set RNDIS (Mode 40) |
AT+CFUN=1,1 |
Full reset modem |
For full syntax, parameters, and response codes see Fibocom_FM350_AT Commands User Manual_V2.10.pdf.
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