What is an IMEI and what can it tell me?¶

An IMEI is a number used to identify a mobile handset on cellular networks.

What this means¶

It is associated with the device hardware rather than with the subscriber, telephone number or app account.

That distinction matters.

It can also help compare activity across different SIMs. If several subscriptions appear against the same IMEI, that may indicate that the same handset was used with different network identities.

An IMEI may be visible in device settings, on packaging, on a label, in provider records or through specialist examination. Some devices support more than one mobile-network interface and may have more than one IMEI.

A device may be borrowed, stolen, shared, resold or used by several people. It may also be remotely managed or used with different accounts over time.

The strongest use of an IMEI is as a correlation tool.

It can link the physical handset to network activity, repair records, purchase records, prior seizures, subscriber data or other evidence sources.

The operational takeaway is: an IMEI identifies the handset, not the person. Use it to connect a physical device with network and documentary records, then build separate evidence about who controlled or used that device at the relevant time.

What to check or do next¶

• If a network record shows an IMEI, it may help establish which handset was used with a particular SIM or subscription at a particular time.

Evidential limits¶

An IMEI does not identify the person who owned, possessed or operated the handset.

Investigators should also be careful with time. A provider record may show that an IMEI was associated with a subscription during a particular connection, but that does not mean the same relationship existed before or afterwards.

In some circumstances an IMEI may be altered, misreported or absent. Do not assume that every system records it in the same way.