| | Countermeasure | |----------------|--------------------| | Quectel | Implement secure boot, cryptographically sign NV items, disable AT+EGMR in production firmware. | | Module integrator | Use hardware security chips to validate IMEI at boot. Periodically query AT+CGSN and compare with a secure stored value. | | Network operator | Deploy IMEI mismatch detection (temporal and geolocation anomalies). Require IMEI-SVN pairing. | | Regulator | Impose certification requirements for modules that allow IMEI writing. |
: A built-in Luhn algorithm check to ensure any entered IMEI is mathematically valid before attempting to write it to the firmware. quectel change imei
Changing the IMEI on Quectel modules is a complex process often used for legitimate hardware repair, development testing, or ensuring compatibility with specific carrier regulations | | Network operator | Deploy IMEI mismatch
The primary command is AT+EGMR . The syntax varies by firmware variant. | : A built-in Luhn algorithm check to
: In some regions, certain modules default to "Phone" IMEIs that carriers may reject for data-only plans; users change them to "Modem" type IMEIs to ensure registration.