What is an IMEI number and why does it matter?

If you have ever bought a smartphone, filed an insurance claim, or reported a lost phone to the police, you have probably heard the term IMEI. But what exactly is it, and why does it matter so much?

What does IMEI stand for?

IMEI stands for International Mobile Equipment Identity. The name tells you exactly what it is: an international (globally recognized) identifier for mobile equipment (your phone or tablet).

Every cellular device manufactured in the world is assigned a unique IMEI before it leaves the factory. No two devices ever share the same IMEI — it is as unique as a fingerprint.

What does an IMEI number look like?

An IMEI is always exactly 15 digits long. Here is an example:

350077 523456789

These digits are not random. Each section carries specific information:

• Digits 1–8 (TAC code): The Type Allocation Code identifies the device manufacturer and model.
• Digits 9–14 (Serial number): A unique serial number assigned by the manufacturer to this specific unit.
• Digit 15 (Check digit): A mathematically calculated digit used to verify the IMEI is valid, using the Luhn algorithm.

How is an IMEI different from a serial number?

A serial number is assigned by the manufacturer and only unique within that brand's products. An IMEI is globally unique across every mobile device ever made, registered with an international database managed by the GSMA.

What is the GSMA?

The GSMA (Global System for Mobile Communications Association) is the international organization that oversees the IMEI system. They maintain the global IMEI database and assign TAC codes to manufacturers. When Apple or Samsung builds a new phone model, they apply to the GSMA for a TAC code — which becomes the first 8 digits of every IMEI on that model.

Why does your IMEI matter?

• Device identification: Networks use your IMEI to identify your device separately from your SIM card.
• Theft protection: If your phone is stolen, carriers can block the IMEI so the device cannot connect to any network.
• Insurance claims: Insurers use your IMEI to verify the device and process claims.
• Second-hand purchases: Checking the IMEI before buying a used phone reveals whether it has been blacklisted.
• Warranty checks: Some manufacturers use the IMEI to verify warranty status.

How do I find my IMEI?

1. Dial *#06# — works on virtually any phone instantly.
2. Settings → About Phone — listed on both iPhone and Android.
3. Phone box or back cover — printed on the original packaging.
4. iTunes / Finder (iPhone) — visible when connected to a computer.

Can someone misuse my IMEI?

Knowing someone's IMEI alone gives very limited ability to misuse it. The IMEI is printed on phone boxes and used routinely by networks and support teams. The real risk to be aware of is IMEI cloning, where criminals copy a legitimate IMEI onto a stolen device — which is illegal in most countries and another reason to buy phones from reputable sources.

Summary

Your IMEI is your phone's global identity — a unique 15-digit number that identifies your device on networks worldwide, protects you if your phone is stolen, and helps verify a device before purchase. Knowing your IMEI is a basic part of responsible phone ownership.