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The IMEI is the device’s modem identifier. The value Hologram stores and shows is the one we receive from the cellular network each time a device connects successfully. The Hologram REST API also returns the IMEISV. The difference is in the final digits:
  • IMEI — 14 digits plus a 1-digit checksum.
  • IMEISV — the same 14 digits plus a 2-digit software version instead of the checksum.
The software version lets you distinguish module firmware versions across devices that use 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