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IMEI
In brief
The IMEI (International Mobile Equipment Identity) is a globally unique 15-digit number that identifies every mobile device, such as a smartphone, a tablet with cellular connectivity or a mobile modem. Network operators use it, for example, to block stolen devices. When decommissioning company phones, the IMEI serves, alongside the serial number, as an identifier to assign each device unambiguously in the device list and erasure proof.
How is an IMEI number structured?
| Part | Digits | Significance |
|---|---|---|
| TAC (Type Allocation Code) | 8 | Identifies manufacturer and model |
| Serial number | 6 | Individual number of the device |
| Check digit | 1 | Detects typing errors, calculated using the Luhn algorithm |
The IMEI number can be displayed on most phones by entering *#06#. It is also in the settings, often on the SIM card tray and on the packaging. Dual-SIM devices have two IMEIs. The IMEI is not to be confused with the manufacturer's serial number or the EID of an eSIM.
IMEI when decommissioning company phones
For companies, the IMEI is a practical identifier because it can often be read even on locked devices. Record the IMEI and Serial number in the device list before phones leave the building. This way each Erasure certificate can later be matched to the right device. Also check whether devices are still bound to management systems or accounts. Which steps matter when decommissioning smartphones is shown by the guide Retiring company phones and erasing data. Second IT erases smartphones with Blancco and issues a digitally signed erasure certificate per device.
Frequently asked questions about the IMEI number
How do I find the IMEI of my phone?
Enter *#06# in the phone app. Alternatively, the IMEI is in the device settings under information about the device and usually on the original packaging.
Does the IMEI change on reset?
No. The IMEI is permanently stored in the device and stays the same after a reset or erasure.
Is the IMEI the same as the serial number?
No. The serial number is assigned by the manufacturer according to its own scheme. The IMEI follows a globally uniform structure for mobile devices.
How many digits does an IMEI number have?
The IMEI has 15 digits. Eight of them form the Type Allocation Code, which identifies manufacturer and model. Six digits are the individual device number. The last digit is a check digit that detects typing errors.
Why do I need the IMEI when decommissioning company phones?
Alongside the serial number, the IMEI serves as an identifier so that every erasure certificate can be assigned to the right device. It can often be read even on locked devices. Dual-SIM devices have two IMEIs. Record the numbers in the device list before handover.
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