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The IMEI is the device’s modem identifier. The IMEI value we store and show is one we receive from the cellular network each time a device connects successfully. In addition the IMEI our REST API will also return values for the IMEISV which is the 14 digit IMEI and 2 digits at the end denoting software version compared to a regular IMEI which is the 14 digits plus a checksum digit at the end. This software version can be used to distinguish between different module versions deployed among your organization’s devices using the same cellular module

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Traditional IMEI = IMEI + 1 digit checksum

4 9 0 1 5 4 2 0 3 2 3 7 5 1 8

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IMEISV = IMEI + 2 digit software version

4 9 0 1 5 4 2 0 3 2 3 7 5 1 0 1