How to Buy a Used iPhone on Facebook Marketplace Without Getting Burned

Why a used iPhone needs more checking than most buys

With a couch or a bike, what you see is what you get. An iPhone is different: some of its most important properties are invisible from the outside, and two of them can turn a working phone into an expensive paperweight.

• Activation Lock. Apple ties every iPhone to its owner’s Apple Account through Find My. Until the owner removes it, nobody else can set the phone up.
• Network blocking. When a phone is reported lost or stolen, carriers can block its IMEI, the number that identifies it on mobile networks. A blocked phone cannot make calls, send texts or use mobile data, whatever SIM you put in it.
• Repairs and parts. A screen or battery replaced with a cheap part looks fine in photos. iOS can tell you when that has happened.
• Carrier lock. Some iPhones only work with the carrier that sold them, and only that carrier can unlock them.

None of this makes used iPhones a bad buy. Most sellers are simply upgrading. It means the checks are specific, and an honest seller will not mind any of them. The broader advice in the guide to whether Facebook Marketplace is safe still applies; this page is about the phone itself.

The used iPhone checklist at a glance

Everything below comes from Apple Support and the Australian Mobile Telecommunications Association (AMTA), checked on 25 October 2026. Do the Settings checks while the seller still has the phone unlocked, then the erase, then the setup check last.

The order matters. Once a phone is erased, you can no longer open Settings without setting it up, so look at everything you need first. The last two rows are the ones you must never skip.

Activation Lock: the one check you cannot skip

Apple’s own advice for anyone buying an iPhone from someone other than Apple is blunt: don’t take ownership of a used iPhone if it is protected by Activation Lock. Apple stores the owner’s Apple Account on its activation servers, and the account password is needed to turn off Find My, erase the phone or reactivate it.

Apple’s article on Activation Lock (checked 25 October 2026) gives the test:

1. Turn the phone on. If you see a passcode Lock Screen or the Home Screen, the phone has not been erased.
2. Ask the seller to erase it in front of you. On current iOS that is Settings > General > Transfer or Reset, then Erase All Content and Settings. Apple says erasing turns off Find My and Activation Lock, so the seller may be asked for their Apple Account password here. That is exactly what you want.
3. Start setup. A phone that is ready to sell reaches the Hello screen. If setup asks for the previous owner’s Apple Account, the phone is still linked to their account.
4. Look for “iPhone Locked to Owner”. On iOS 15 and later, that screen appears when a phone is protected by Activation Lock.

If the phone is still linked, Apple’s advice is to hand it back so the seller can enter their password, or, if the owner is not there, have them remove it from their account in a browser before you take it. On Marketplace, a seller who cannot do this on the spot is a seller to walk away from: “they’ll remove it tonight” may be true, but you cannot make it happen after you have paid.

Be wary of listings that mention “iCloud locked”, “for parts” on a phone that looks perfect, or a seller who will only post it. The guide to Facebook Marketplace scams covers the patterns that come up again and again with phones.

IMEI checks, stolen phones and proof of ownership

Every iPhone has a serial number and an IMEI. Apple’s support article shows both under Settings > General > About; on many models the IMEI is also printed on the SIM tray, although iPhone 14 models and later have no IMEI engraving. AMTA notes you can also dial *#06# to show it.

In Australia, AMTA runs a free checker that shows whether a phone’s 15-digit IMEI is currently blocked on Australian mobile networks. A blocked phone cannot make calls, send texts or use data, and AMTA is clear that inserting a different SIM will not make it work. Its page (checked 25 October 2026) also spells out what the check does not prove:

• There can be a 3-5 day delay between a phone being reported to a provider and the block showing up, so a clean result on a just-stolen phone means little.
• It shows current status only and is not proof of ownership.
• It cannot tell you about outstanding payments or whether the seller has the right to sell the phone.

AMTA also warns about a scam aimed squarely at Marketplace buyers: the seller reports the phone lost or stolen after the sale, it gets blocked, and without proof of ownership you may not be able to use it. So its advice is to ask for a receipt or invoice and check that the IMEI on the phone matches the box and the receipt. A box and receipt are not a guarantee, but a seller with neither, offering a recent model well under the going rate, is the profile to be careful of.

While you have the serial number, Apple’s coverage page (checkcoverage.apple.com) shows the warranty and AppleCare status, a quick way to confirm the model and age match the listing.

Battery health, repairs and carrier lock

Battery. Settings > Battery > Battery Health shows Maximum Capacity, which Apple describes as the battery’s capacity relative to when it was new. Apple says iPhone 14 and earlier models are designed to keep 80% of their original capacity at 500 complete charge cycles under ideal conditions, and iPhone 15 models at 1,000. A lower figure is not a fault, but it is a fair reason to adjust your offer. If the phone says it is unable to verify the battery, Apple says it cannot confirm the battery is a genuine Apple part, so the health figure may not be accurate.

Repairs. On iOS 15.2 and later, Settings > General > About shows a Parts and Service History section if the phone has been repaired. No section means no recorded repair. Apple’s labels are worth knowing:

• Genuine: repaired with genuine Apple parts and processes.
• Unknown: the part may not be genuine, may not be working as expected, or has not been verified after the repair. Apple notes this can affect trade-in value.
• Used: the part came out of another iPhone; Apple says performance and quality may be inconsistent.
• Unverified: the logic board has been replaced, which Apple says might affect features such as Apple Pay.

A repaired phone is not automatically a bad buy. What matters is whether the seller told you. An “Unknown” display on a phone listed as “original, never repaired” tells you how much to trust the rest of the listing.

Carrier lock. In the same About screen, Apple says “No SIM restrictions” next to Carrier Lock means the iPhone is unlocked. If it is locked, Apple cannot unlock it; only the carrier can. Put your own SIM in and make a test call before paying, which AMTA also recommends, and you have checked the network side in one go.

Testing it in person, and paying safely

Do the checks above face to face. A phone that is posted to you cannot be erased in front of you, and that is the one step that protects you most. Meet somewhere public in daylight, or at the seller’s front door, and give yourself ten unhurried minutes.

Before the erase, while the seller has it unlocked, try the things photos cannot show:

• Lock and unlock it with Face ID or Touch ID.
• Open the camera and try the front camera and every rear lens.
• Play a video for the speakers, and make a call to check the earpiece and microphone.
• Plug in a charger to check the port, and look along the screen for lifting or dead spots.
• Check the buttons and the silent switch or Action button.

Then the erase, the setup check and your SIM. If anything fails, you are still standing there with your money.

Agree the price before you meet; the guide to negotiating on Facebook Marketplace covers making an offer that keeps the seller interested. If the battery or a repair turns out different from the listing, it is fair to say so and adjust then. Pay only after every check has passed, in a way you can trace, and keep the conversation in Facebook’s messages. Never send a deposit to “hold” a phone you have not seen; that request is one of the most common phone scams on the platform.

Why the cheap iPhones are gone within the hour

Here is the listing everyone wants. Someone has just upgraded, and the old phone goes up mid-morning: “iPhone, unlocked, always in a case, box and charger, need it gone.” Battery health in the photos. Priced to sell rather than priced to wait.

Phones are one of the busiest categories on Marketplace, because a well-priced iPhone is easy to use, easy to resell and easy to check. Dozens of buyers in any city are searching the same model names. The first message lands within minutes, a few more follow, and the seller picks whoever can come today with cash ready. By lunchtime it is pending.

That is the uncomfortable part of the checklist above: the careful buyer is often the slow buyer. You cannot do anything about the checks, and you should not try. What you can change is when you see the listing. Refreshing the app a few times a day leaves hours between looks, and the phones worth having are claimed inside those hours. The guide to sniping deals on Facebook Marketplace explains why being first matters more than anything else on a fixed-price marketplace, and the piece on first come, first served covers what to say in that first message.

Where Outpost Alerts fits

The checks are yours. Seeing the listing in time is the part a tool can help with, and that is the job Outpost Alerts does.

Outpost Alerts is an Australian-built service that watches Facebook Marketplace for new listings matching your keywords and sends them to an iPhone app, a web dashboard or Discord. It searches from its own servers, so it does not need your Facebook login. The fastest watchlist is checked every minute on Pro, every 3 minutes on Standard and every 30 minutes on Basic; additional watchlists run a little slower (3 minutes or more on Pro, 5 minutes or more on Standard). If you are comparing alert apps for your phone, the roundup of iPhone apps for Marketplace alerts sets them side by side.

A watchlist for a used iPhone might look like this:

• Search phrase: the exact model, such as “iphone 15 pro”. One model per watchlist keeps the feed clean.
• Exclude words: case, cracked, broken, parts, icloud, wanted, swap. Do not exclude “locked”: exclude words match anywhere in the text, so it would also drop every listing that says “unlocked”. The guide to excluding words on Marketplace explains how matching works.
• Price ceiling: a little below what that model usually sells for near you, from your own research.
• Location: one location and a radius from 5 to 500 km per watchlist. Keep it to the distance you would drive today to meet in person.

Outpost also filters what reaches you. Across 30,777 listings that matched a keyword, 38.6% were discarded as not the item being searched for; for phones, that means the cases, screen protectors, chargers and empty boxes that share the model name.

What it does not do: it does not check Activation Lock, run an IMEI check or tell you whether a phone is genuine. Those checks stay yours, on the spot. It watches Facebook Marketplace only, it does not message the seller for you, it has no Android app (Android users use the web dashboard), and it has no free plan (every plan has a 3-day trial). What it changes is whether you see the well-priced iPhone while it is still for sale. More ready-made searches are in the Facebook Marketplace watchlist ideas.

FAQ

Sources checked

• Apple Support: Activation Lock for iPhone and iPad (checked 25 October 2026): checking a used device before you take ownership.
• Apple Support: What to do before you sell, give away, or trade in your iPhone or iPad (checked 25 October 2026): erasing the device turns off Find My and Activation Lock.
• Apple Support: Find the serial number, EID, or IMEI on your iPhone (checked 25 October 2026).
• Apple Support: iPhone battery and performance (checked 25 October 2026): Battery Health and Maximum Capacity.
• Apple Support: iPhone Parts and Service History (checked 25 October 2026).
• Apple Support: How to unlock your iPhone for use with a different carrier (checked 25 October 2026).
• Apple: Check Coverage (checked 25 October 2026): warranty and AppleCare status by serial number.
• AMTA: Check if a phone has been reported lost or stolen (IMEI status) (checked 25 October 2026).

Marketplace features, fees, and policies change. Confirm current rules in Facebook's Help Center before relying on specific details.