Activation Lock: How to Check a Used iPhone or Mac Before You Buy It

What Activation Lock is

You buy a used iPhone or Mac in flawless physical condition, turn it on for the first time, and instead of Apple's familiar "Hello" screen you see a prompt asking for someone else's Apple ID password. That's Activation Lock, and it's the most common reason a seemingly perfect used Apple device ends up completely unusable.

Find My (formerly Find My iPhone) permanently ties a device to its owner's Apple ID for security. If it's lost or stolen, no one else can activate or use it without the original account's password — even after a full content erase. Fewer people know that the exact same system now covers Mac too: any model with a T2 chip (2018 onward) or Apple Silicon (M1 and later) has its own Activation Lock via Find My Mac, not just iPhone and iPad.

On Apple Silicon Macs the lock is actually stricter than on iPhone. When you run "Erase All Content and Settings" on one of these Macs, recoveryOS itself automatically demands Owner confirmation via Apple ID before it will allow the firmware-level wipe — it's not a setup screen you hit after rebooting, like on iPhone, but part of the erase process itself.

Why it shows up on used devices

In most cases it's not fraud — just carelessness. The seller runs "Erase All Content and Settings" assuming the device is now clean, but if they didn't first sign out of Find My in Settings, Activation Lock stays on. The device looks visually "wiped" — no personal photos or apps left — but it's still locked to their account. Often the seller doesn't even realize it until the buyer emails them complaining.

There's also the rarer, malicious case: someone knowingly sells a stolen or locked device, hoping the buyer won't get a chance to check before the deal closes — especially common in listings with a "suspiciously low price" or a seller who avoids meeting in person. Either way, the result for the buyer is the same: a device they can never actually use.

It's not the same as carrier lock or MDM

Three different "locks" often get confused with each other, but each needs completely different handling. Activation Lock ties to one person's Apple ID through Find My, as described above. Carrier lock is something else entirely: the device only works with a specific carrier's SIM, usually because it was bought subsidized under contract — it's resolved with an unlock request to that carrier, not through Apple.

The third, less known one, is MDM lock (Mobile Device Management): devices that belonged to a company, school, or organization and were enrolled in a fleet management program stay "tied" to it even if resold used — often showing up in cheap bulk lots from leasing companies. It can only be removed by the organization's administrator, never by the individual seller. If a device asks "This iPhone is managed by [organization name]" during activation, that's MDM lock, not Activation Lock, and the fix lives elsewhere.

How to check before you buy

Apple has an official, free checking tool at checkcoverage.apple.com. You only need the device's serial number or IMEI — find it on the box, engraved on the Mac itself (under the base on older models), or from within the device if it's already activated: Settings → General → About on iPhone/iPad, System Settings → General → About on Mac. On iPhone you can also dial #06# in the Phone app to reveal the IMEI instantly, without even activating the device.

The tool shows two separate things about the device's security status: warranty coverage, and further down the page, the Activation Lock status — "Enabled" or "Disabled." If you see "Enabled" on a device you don't own yet, don't go through with the purchase until it's resolved, no matter how good the price looks. Worth noting: the tool only checks Activation Lock — it doesn't show carrier lock or MDM enrollment, so it isn't a complete guarantee of a clean device on its own.

If you're buying in person, the most reliable test isn't any online tool but the device itself: ask the seller to run "Erase All Content and Settings" in front of you and watch the next screen. If the device starts up clean, with the familiar "Hello" and the setup assistant, you're good. If it asks for an Apple ID password before you even reach the setup step, the device is locked — and you shouldn't go ahead with the purchase.

Quick 3-step check

Before you hand over money for any used iPhone, iPad, or Mac: first, find the serial number or IMEI and check it at checkcoverage.apple.com. Second, ask the seller to fully erase the device in front of you and see whether it starts up clean without asking for someone else's password. Third, if the device has already been activated on your own account, go to Settings → [your name] → Find My and confirm the device itself shows up there normally, with no lock warnings.

What to do if you already bought a locked device

The first and only genuinely reliable step is to contact the seller again and ask them to remove the device from their own iCloud account — either remotely from Find My at iPhone.com/iCloud.com, or by giving you their password for one-time use. Keep written communication (messages, email) from the start of the deal — if you need to escalate to Apple Support or, worst case, file a complaint, you'll need it.

If you have genuine proof of purchase in your own name — a receipt, invoice, or chat transcript clearly referencing the serial number — Apple can, in some cases, remove the lock through Apple Support, either by phone or at a physical Apple Store. The process isn't instant: it usually requires identity verification and can take anywhere from a few days to a few weeks, and it isn't guaranteed if your proof of purchase isn't convincing.

Avoid third-party services entirely that promise "IMEI unlock" or "Activation Lock bypass" for a fee. At best it's a scam that does nothing; at worst, they use methods that violate Apple's terms of service, permanently void any chance of warranty or support, and in some countries are legally questionable if the device turns out to be stolen.

How to protect yourself when you sell a device

The same logic applies in reverse if you ever sell your own device. Before handing it over: sign out of iMessage and FaceTime (Settings → Messages / FaceTime), turn off Find My from Settings → [your name] → Find My → Find My iPhone/Mac, and only then run "Erase All Content and Settings." In that order, the device comes out clean with no lock at all, and you won't accidentally leave your own old device "locked" to some stranger who buys it.

The check we run at flip2store

Every device that goes through flip2store is explicitly checked for Activation Lock and iCloud lock before it ever reaches the catalog — it's one of the steps in the quality control we run on every used device, alongside the functionality, screen, battery, and chassis checks we describe in detail on the Grading page. If a device isn't completely clean, it simply doesn't go up for sale — there's no way you'll ever come across it in one of our listings.

That's also why every purchase from flip2store comes with a 12-month warranty: you don't need to run any of these checks yourself when you buy from us. But if you're shopping for a used iPhone or Mac anywhere else, keep this guide handy — a two-minute check at checkcoverage.apple.com can save you hundreds of euros.