¿Qué es un Número IMEI? Todo lo que Necesitas Saber

Every phone in the world has a fingerprint — not the kind you unlock it with, but a 15-digit code burned into its hardware before it ever leaves the factory. It is called the IMEI number, and it is the single most important identifier your device has.

Whether you are buying a used phone, reporting a stolen device, unlocking your carrier, or just curious about what that number in your settings actually means — understanding IMEI is worth five minutes of your time.

What Does IMEI Stand For?

IMEI stands for International Mobile Equipment Identity. It is a unique 15-digit number assigned to every mobile device that connects to a cellular network — phones, tablets, mobile hotspots, even some laptops with SIM card slots.

Think of it as your phone's social security number. No two devices in the world share the same IMEI. It is assigned during manufacturing and cannot be changed through normal means (altering it is illegal in most countries).

How to Find Your IMEI Number

There are several ways to find your phone's IMEI:

Method 1: Dial *#06

This works on virtually every phone — Android, iPhone, feature phones, everything. Open your dialer, type *#06#, and your IMEI displays instantly. No need to press call.

Method 2: Check Your Settings

• iPhone: Settings → General → About → scroll to IMEI
• Android: Settings → About Phone → IMEI
• Samsung: Settings → About Phone → Status → IMEI Information

Method 3: Check the Physical Device

• SIM card tray: Some phones print the IMEI on the SIM tray
• Back panel: Older phones (and some newer ones) print it on the back
• Original box: The IMEI is always on the retail packaging barcode label

Method 4: Your Carrier Account

Log into your carrier's website or app — your IMEI is listed under your device details.

Pro tip: Write your IMEI down and store it somewhere safe before you need it. If your phone is stolen, you will not be able to dial *#06# to get it.

The Anatomy of an IMEI Number

An IMEI is not random. Each of the 15 digits encodes specific information:

AA-BBBBBB-CCCCCC-D
│  │       │      └─ Check digit (Luhn algorithm)
│  │       └──────── Serial number (unique to each device)
│  └────────────────  Type Allocation Code (device model)
└───────────────────  Reporting Body Identifier

Digits 1-2: Reporting Body Identifier (RBI)

Identifies which regional body approved the device's TAC. Common values:

• 35 → British Approvals Board (BABT)
• 01 → PTCRB (North America)
• 86 → TAF (China)

Digits 3-8: Type Allocation Code (TAC)

Combined with the RBI, the first 8 digits form the TAC, which identifies the exact device model. Every iPhone 15 Pro has the same TAC. Every Galaxy S24 Ultra has a different one. The TAC is what IMEI lookup services use to tell you the brand and model from just the number.

Digits 9-14: Serial Number

A unique serial number assigned by the manufacturer to that specific unit. This is what makes your phone's IMEI different from every other phone of the same model.

Digit 15: Check Digit

Calculated using the Luhn algorithm — the same checksum used by credit card numbers. It catches typos and transcription errors. If someone reads you their IMEI over the phone and mistypes a digit, the check digit will not match.

What Is Your IMEI Used For?

1. Stolen Phone Blacklisting

When you report a phone stolen, your carrier adds its IMEI to a shared blacklist database. This prevents the phone from connecting to any carrier network in the country (and in many cases, internationally through the GSMA's global blacklist).

This is the single most important use of IMEI. A blacklisted phone is essentially a paperweight for cellular connectivity.

2. Carrier Unlocking

When you ask your carrier to unlock your phone for use with other networks, they process the unlock request using your IMEI. The unlock is tied to the IMEI, not your SIM card or account.

3. Warranty Claims

Manufacturers track warranty status by IMEI. When you contact Apple, Samsung, or any manufacturer for support, the first thing they ask for is your IMEI to verify your device, purchase date, and warranty coverage.

4. Buying Used Phones

Before buying a second-hand phone, always check its IMEI against blacklist databases. A phone with a blacklisted IMEI will not work on cellular networks, and you will have no recourse.

5. Insurance Claims

Mobile insurance providers require the IMEI to process claims. It proves which specific device was insured and verifies it matches the claim.

6. Law Enforcement

Police use IMEI numbers to track stolen devices, verify evidence, and identify devices involved in investigations. Carriers can locate a device on their network using its IMEI.

IMEI vs. MEID vs. ESN

With the global transition to LTE and 5G (which use GSM-based technology), IMEI has effectively won. Even formerly CDMA-only carriers like Verizon now use IMEI for all their devices.

IMEI vs. IMEI/SV

You might see IMEI/SV (or IMEISV) in your phone settings. This is a 16-digit version that replaces the Luhn check digit with a 2-digit Software Version Number (SVN). It tells the network not just which device you have, but which firmware version it is running.

IMEI/SV is used internally by networks and is not typically needed by consumers.

Can You Change Your IMEI?

Technically, it is possible to reprogram an IMEI on some devices. But it is illegal in most countries. In the UK, the Mobile Telephones (Re-programming) Act 2002 makes it a criminal offense. In the US, it violates FCC regulations. Similar laws exist across Europe, Australia, India, and many other countries.

IMEI tampering is associated with:

• Laundering stolen phones
• Evading law enforcement tracking
• Bypassing carrier blacklists
• Warranty fraud

The penalties range from fines to imprisonment depending on jurisdiction.

Generating IMEI Numbers for Testing

Developers building mobile device management (MDM) systems, phone tracking apps, or IMEI validation features need test IMEI numbers that are structurally valid but not assigned to real devices.

Random IMEI Generator creates valid 15-digit IMEI numbers that:

• Follow the correct TAC + serial + check digit structure
• Pass Luhn algorithm validation
• Can be generated for specific device types
• Are not linked to any real physical device

This is essential for software testing, database development, and building IMEI-related tools without using real device identifiers.

FAQ

Is it safe to share my IMEI number?

Be cautious. While someone cannot directly hack your phone with just an IMEI, they could potentially use it for warranty fraud, social engineering attacks on your carrier, or cloning (in theory). Share it only with your carrier, manufacturer, or trusted services. Never post it publicly.

Can a phone have two IMEI numbers?

Yes. Dual-SIM phones have two IMEI numbers — one for each SIM slot. When you dial *#06# on a dual-SIM phone, both numbers are displayed. Each connects independently to the cellular network.

Does factory reset change the IMEI?

No. The IMEI is stored in a protected area of the phone's hardware/firmware and is not affected by factory resets, software updates, or SIM card changes. It is permanent.

Can I track my phone using IMEI?

You personally cannot track a phone by IMEI — that requires carrier-level network access. However, if you report your phone stolen to police and provide the IMEI, carriers and law enforcement can potentially locate it on the network. For personal tracking, use Find My iPhone or Google Find My Device instead.

What does a blacklisted IMEI mean?

A blacklisted IMEI means the device has been reported as lost, stolen, or involved in fraud. Carriers share blacklists nationally (and sometimes internationally), and a blacklisted phone cannot connect to cellular networks. It can still connect to Wi-Fi, but cellular service is blocked.

How long is an IMEI number?

A standard IMEI number is exactly 15 digits. IMEI/SV (Software Version) is 16 digits. If someone gives you an IMEI that is shorter or longer, it is likely incorrect or a different identifier entirely.