iCloud activation lock and the IMEI

What activation lock actually is

When Find My is switched on, an iPhone is tied to the Apple Account that set it up. Erase the device and it still demands that account's password before it will finish setup. That is activation lock, and it is deliberately not something a new owner can work around — which is exactly why it is worth checking before money changes hands.

A locked iPhone is not a broken iPhone. It is a working device that nobody except the previous owner can use.

Why no site can check it from an IMEI

Apple ran a public activation lock status page until early 2017, then withdrew it. The reason was straightforward: unlock services and resellers were using it to test large batches of numbers, which is not what it was for.

Since then activation status has only been readable through Apple's service channel, available to authorised service providers, not to the public and not through any API a lookup site can call. So when a site offers a free instant iCloud check from an IMEI, there is no data source behind it. It is showing you a guess, or collecting the number for something else.

This is the same wall described in what an IMEI check cannot tell you — the information exists, it is simply held by a company that does not publish it.

The check that does work

Activation lock has one reliable test, and it costs nothing. With the device in front of you:

1. Open Settings → General → Transfer or Reset iPhone and erase it, with the seller present.
2. Let it restart and walk through setup. If it reaches the home screen without asking for an Apple Account password, it is clear.
3. If a sign-in screen naming someone else appears, stop. Only that account holder can remove it — not you, not a repair shop, not a paid unlock service.

A quicker partial signal: in Settings, if an Apple Account is still signed in at the top of the screen, the device has not been prepared for sale. Ask the seller to sign out and erase it before you go further.

What a free IMEI lookup gives you here

It confirms which device you are actually being offered. That matters more than it sounds: a listing photo and a model name are easy to get wrong or misstate, and the TAC settles it from the number itself. It also catches a mistyped IMEI through the checksum, before you spend time on a number that was never valid.

What it cannot do is tell you whose account the phone is attached to. Nothing free can.

Activation lock is not the same as carrier lock

Two different locks, often confused. Activation lock is an Apple account tie and follows the device until the owner releases it. Carrier lock restricts the handset to one network and is held by that carrier. A phone can have either, both, or neither, and neither is encoded in the IMEI.

The short version

Use an IMEI lookup to confirm the device is what it claims to be. Use a factory reset in front of the seller to confirm it is not locked to someone else. Anyone selling you an iCloud check from the number alone is selling you nothing.