Usually, each time a data session is attached, the IMEI of the cellular module used to connect will be sent to us by the carrier and will be displayed on the device's page. However, not all carriers provide us with IMEI information so there are situations where your device will connect, but the IMEI will not be populated.
Note: It is best practice to match the IMEI based on the identifying information printed on the device/modem with the device's SIM number in your database prior to sending it to the field. If you move a SIM between devices or replace the cellular module or modem in a device, your IMEI will change.