Can You Change a Phone’s IMEI? The Law, the Risks and the Truth

Search for “change IMEI” and you’ll find apps, cables and sellers promising to give any phone a fresh identity in minutes. The short answer to whether that’s possible is: technically sometimes, legally often not, and practically almost never worth it. On many phones the IMEI is protected in hardware; where it can be rewritten, doing so is a criminal offense in a growing number of countries.

For buyers, the more useful question is the reverse one: has this phone’s IMEI been changed? A tampered IMEI is one of the strongest signs that a device is stolen, counterfeit or hiding a blacklist entry. This guide covers the law, the reasons people do it, why it backfires, and exactly how to spot it.

What the IMEI is, and why it’s meant to be permanent

The IMEI is the 15-digit identity a phone presents to the mobile network every time it connects. Its first eight digits are the TAC, which identifies the brand and model; the next six are a unique serial; the last is a check digit calculated with the Luhn formula (see how the IMEI check digit works).

The whole point of the number is that it stays fixed for the life of the device. That’s what lets networks block stolen phones, lets manufacturers track warranty and recalls, and lets regulators confirm that a device is certified. The GSM industry standards require manufacturers to protect the IMEI against change after the phone leaves the factory, and modern phones store it in protected, often signed, storage areas tied to the main board.

Is changing an IMEI illegal?

It depends on where you are, but in many countries the answer is yes:

• United Kingdom: the Mobile Telephones (Re-programming) Act 2002 makes it an offense to change or interfere with a phone’s unique identifier, and to own, supply or offer equipment for doing so with intent to use it that way. The maximum penalty for the most serious form of the offense is five years in prison. The Act exempts the manufacturer and those acting with the manufacturer’s written consent — which is how authorized board repairs stay legal.
• India: has specific rules against tampering with device identifiers, and its newer telecom legislation treats changing telecom identifiers as an offense.
• Other countries: even where no law names the IMEI specifically, changing it to hide a stolen phone, evade a network block or avoid device registration can fall under fraud, theft, handling stolen goods or telecom laws.

Laws change and this isn’t legal advice, but the direction is clear: regulators increasingly treat IMEI tampering as the tool of phone theft, not a harmless tweak.

Why people try to change an IMEI

Understanding the motive helps you spot it:

• Hiding a stolen or blacklisted phone. The most common reason. A phone reported to the GSMA blacklist stops working on many networks; a new IMEI is an attempt to make it look clean.
• Evading device registration or import tax. Some countries block phones that haven’t been registered or had duty paid. Rewriting the IMEI to a registered one is a known abuse.
• Counterfeit manufacturing. Clone phones are often flashed with a real IMEI copied from a genuine device, sometimes thousands of clones with the same number.
• “Repairing” a corrupted IMEI. Some Android phones lose their IMEI after a bad firmware flash (showing as null or 0). The legitimate fix is restoring the phone’s own original IMEI through the manufacturer’s service process — not inventing or copying a different one.

Why it rarely works the way sellers claim

Even when a tool manages to rewrite the number, the device usually gives itself away:

• Duplicates get noticed. When two phones present the same IMEI on a network, operators can see the conflict. Cloned IMEIs often end up blocked, taking the innocent original down too.
• Records don’t match. Manufacturer databases tie each IMEI to a specific model, serial and sale. A borrowed IMEI from a different model fails an ordinary manufacturer and model check.
• iPhones have more than one identity. Apple activation relies on several hardware identifiers, not just the IMEI. A different IMEI does nothing to Activation Lock — the phone still asks for the owner’s Apple ID.
• Updates undo it. Many hacks are wiped by the next firmware update or factory reset, leaving the buyer with a phone that suddenly shows the original (blacklisted) number or none at all.
• Hardware protection. Modern flagship phones store the IMEI in secured storage that typical tools can’t write. Phones with rewritten IMEIs are disproportionately older or low-cost models.

The practical result: someone who buys a phone with an altered IMEI is usually the one who ends up with a blocked handset and no legal claim to it. If the original IMEI was blacklisted, read whether a blacklisted phone can be unblocked — legitimately, only the person who reported it can start that process.

How to detect a tampered IMEI

A genuine phone shows the same IMEI everywhere it appears. Collect every source and compare them:

Red flags

• Mismatch between *#06# and Settings, tray or label. One of them has been altered or swapped.
• An invalid check digit. Manufacturers never ship an IMEI that fails Luhn. If the phone itself shows one, walk away.
• TAC belongs to another model. The first eight digits say “Galaxy A-series” but you’re holding an S-series? The IMEI was copied from another device. See what a TAC code is.
• Both IMEIs identical on a dual-SIM phone, or a suspicious pattern like many zeros.
• IMEI shows as null, 0 or “unknown baseband” — the phone was badly flashed, and network service will be unreliable at best.
• Signs of modified firmware: unlocked bootloader warnings at boot, root apps, or a seller who insists on keeping the phone on “their” firmware.

Validate the number in seconds

Paste the IMEI from *#06# into the validator. It checks the length and the Luhn check digit locally, without sending the number anywhere:

Want to look at the TAC directly? In the terminal below, type tac followed by the first 8 digits of the IMEI and press Enter, then type imei followed by the full 15 digits to see the full breakdown:

Verify against the records

A valid-looking number still has to match the phone. Run these checks in order:

1. Manufacturer + model — does the IMEI belong to the brand and model in your hand?
2. All-in-one Basic Info (IMEI or serial) — model, color and storage details to compare with the device. For iPhones, the Apple All-in-one report adds Find My status.
3. GSMA blacklist status — has this IMEI been reported lost or stolen? For US phones add the USA blacklist / barred check.

If the records describe a different phone, assume the IMEI is not original — even if the seller has an explanation. Our IMEI check page explains every report in more detail.

The bottom line

You can’t legally give a phone a new identity in many countries, and even where you technically can, the change tends to fail exactly when it matters. As a buyer, treat any IMEI inconsistency as a deal-breaker. As an owner, protect your own IMEI: write it down, keep the box, and if the phone is stolen, report it to your carrier and police so the number can be blocked.