Note: Before you begin, please ensure your SIM is successfully activated in the Hologram Dashboard.
For instructions on sending AT commands to a device, click here. Keep in mind that the instructions are written for Hologram Novas but use basic serial communication and standard AT commands so the same commands can be used on all modems. If you are unable to open a serial communication channel with your modem, contact your original equipment manufacturer for instructions on sending AT commands to your device.
Modem, Module, & SIM Diagnostic Procedure
Using your favorite terminal program (Screen, Teraterm, Putty, GTKTerm, etc.), run the following commands and record their outputs. Note, the last command, below, may take up to 3 minutes to complete.
| Command | Function | Sample Response |
| AT | Attention | OK |
| ATI | Module Number | SARA-U201-03B-00 |
| AT+CGMI | Manufacturer Specific Identity | u-blox |
| AT+CGMM | Manufacturer Specific Model Identity | SARA-U201 |
| AT+GMM | Manufacturer Specific Model Identity | SARA-U201 |
| AT+CPIN? | Check The SIM PIN | +CPIN: READY |
| AT+CCID | Check The SIM ICCID | +CCID: 1234567890123456789 |
| AT+CRSM=176,28539,0,0,12 | Read Data File 28539 In Binary Mode | +CRSM: 144,0,"FFFFFFFFFFFFFFFFFFFFFFFF" |
| AT+CFUN? | Determine What Mode the Module Is In | +CFUN: 1,0 |
| AT+CSQ | Signal Quality | +CSQ: 22,4 |
| AT+CREG? | Network Registration Status | +CREG: 0,5 |
| AT+CGREG? | GPRS Network Registration Status | +CGREG: 0,5 |
| AT+CEREG? | EPS Network Registration Status | +CEREG: 2,5,"MI9S","25SS404",8 |
| AT+CGDCONT? | Read PDP Context's Parameters (APN) | +CGDCONT: 1,"IP","hologram","0.0.0.0",0,0 |
| AT+CGACT? | PDP Context Activation | +CGACT:1,0 |
| AT+COPS? | Operator Selection Status and Current Operator | +COPS: 1,2,"310260",2 |
| AT+COPS=? | Networks In Reach | +COPS:(1,"AT&T","AT&T","310410",2) |
If you are not seeing the AT commands, you are typing try sending ATE.