AT+CFUN=1,1
Where:
: Engineers testing network equipment may need to temporarily assign test IMEIs in controlled laboratory environments.
The popular Quectel EC25 and EG25-G (Qualcomm) are the easiest to modify. The newer RM5xx series (5G) requires signed security binaries. quectel change imei
Quectel modules are controlled using via a serial interface. The standard command used to view the current IMEI is: AT+GSN or AT+CGSN
To communicate with Quectel modules, you use a series of (Hayes command set) sent via a serial port (UART or USB AT Port). 1.1. Querying the Current IMEI
If a modified IMEI is detected as invalid or suspicious, carriers can blacklist the device entirely, preventing network registration across multiple providers. AT+CFUN=1,1 Where: : Engineers testing network equipment may
Often, issues arise not from the IMEI, but from incorrect Access Point Names (APN). Use AT+CGDCONT to configure the correct APN for your provider.
Restart the module and send AT+GSN to confirm the change has been applied. Limitations and Firmware Variations
: You may need to "unlock" the modem first using a command like AT+QPRTPARA=1 Quectel modules are controlled using via a serial interface
There are a few scenarios where changing the IMEI might be necessary:
Aisha, a senior firmware engineer at a small IoT security startup, stared at the alert on her screen. One of their fleet of air quality monitors, deployed across a city’s subway system, had gone silent. Then another. Then fifty.
If you are an OEM programming 10,000 modules, use Python with pyserial .
– Keep the module’s IMEI unchanged and route traffic through a proxy that masks the identifier.