What to check when buying a second-hand iPhone
No single screen certifies a used iPhone. Check it in layers: identity, Activation Lock, battery, parts, carrier, business management, physical condition and functions. If Activation Lock linked to the previous owner appears, the purchase stops.
Limit: this guide is a purchase screening, not a certificate of authenticity or ownership, nor a professional technical diagnosis. A consistent IMEI, active AppleCare or a high battery figure do not on their own make the transaction safe.
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First: what kind of evidence you have
Do not mix what the seller declares with what you can observe or confirm. The same figure changes in value depending on where it comes from.
UNKNOWN means a piece of data is missing. INCONCLUSIVE means there is evidence, but it is not enough to resolve the doubt. Neither automatically equals “fraud” or “fake iPhone”.
REMOTE
Before meeting: reduce uncertainty without asking for invasive data
Goal: arrive at the inspection with the model, repairs and specific doubts already narrowed down.
Ask for minimal information and useful photos.
Test the hardware and relevant settings.
Check that it is no longer linked to the previous owner.
Compatible, UNKNOWN, INCONCLUSIVE or hard-stop.
What to ask for beforehand
Declared model/capacity; battery health if available; whether it has had repairs; photos of the screen, frame, cameras and port; and, if you need to use another carrier, the carrier lock status.
What not to ask for by default
You do not need an ID document (DNI), an Apple Account password, the full IMEI or serial number, or an invoice with name, address, email and tax details visible. A cropped screenshot or an in-person inspection is usually enough.
Buying online
Confirm which return conditions apply to the specific channel and check the device when you receive it. Do not invent a universal window: it depends on the platform, seller and type of sale.
Buying in person
Set aside time to test the phone and for the seller to erase the device in front of you. Do not leave the Activation Lock step for “later”.
HARD-STOP
Activation Lock: the lock that stops the purchase
Apple advises not to buy a used iPhone that is still protected by Activation Lock.
“Only the owner of this iPhone can unlock it”
If this appears when you switch it on or activate it, the device is still linked to the previous owner’s Apple Account. Do not continue with the purchase until the legitimate owner properly removes it from their account and you can verify the resulting status.
If you see a lock screen or the home screen, ask the seller to erase the content properly before closing the purchase.
If, during activation, it asks for the previous owner’s credentials: stop. There is no legitimate “bypass” that Barguvo recommends.
That resolves the Activation Lock link, but it does not certify the battery, parts, IMEI, functions or documentary ownership.
IDENTITY
Model, capacity, region and software: check the actual device
Do not use the external appearance as the only proof. Identify the model from Settings/About and compare it with the official documentation when the variant matters.
Model and capacity
Check the name/model, capacity and model number. The A number and region can change the SIM tray, compatibility and other physical details.
Connector by generation
Apple’s general guide to buying used still mentions “Lightning”, but iPhone 15 and later use USB‑C. The inspection must be model-aware: check the connector that corresponds to the specific model.
iOS compatibility
This is dynamic data. Check the current official list on the day of purchase if software support is decisive. “It does not get the latest version” does not automatically mean “unsafe” or “useless”.
Consistency, not a certificate
Consistency between model, capacity, housing, box and documents adds evidence. A single match does not prove ownership or full authenticity.
BATTERY
Battery: context by generation, not “80 % = pass”
Maximum capacity is a sign of wear, not a purchase verdict. Interpret it together with system messages, cycles where available, expected battery life and replacement cost.
REPAIRS
Parts and history: read the right label for that model
On compatible iOS, Settings → General → About can show the parts and service history. The parts available depend on the model.
Genuine
According to the system, the repair was carried out with genuine Apple parts and processes.
Used
The part is Apple’s but had already been used or installed in another iPhone. It may have previous wear.
Unknown
It may be due to a non-genuine part, unexpected behaviour, an incomplete/unlinked repair or a modification. It does not automatically mean the whole iPhone is fake.
Unverified
It has a specific meaning in the history, for example for a previously used logic board. It may affect specific functions and needs context.
Used parts and Activation Lock: Apple documents that certain used parts may remain linked to another Apple Account. If a lock or an incomplete repair appears, resolve it before treating the device as normal.
IN PERSON
Functional tests: reproduce what matters without doing a diagnosis
Test basic functions with the seller present and the device ready. A short test detects obvious faults; it does not rule out intermittent defects.
Display and touch
- Test
- Brightness, touch response and areas of the screen.
- Look for
- Flickering, spots, lines, dead zones or uneven brightness.
- Does not prove
- That there are no intermittent faults or internal damage.
Port and charging
- Test
- The right connector for the model: Lightning on the corresponding generations; USB‑C from iPhone 15.
- Look for
- Damage, dirt and that it accepts charge steadily.
- Does not prove
- The overall health of the battery or board.
Cameras and video
- Test
- A photo in good/low light, focus, available lenses and video.
- Look for
- Focus, sharpness, strange vibration, spots and video audio.
- Does not prove
- That all advanced functions perform under any conditions.
Audio and microphone
- Test
- Speaker with system sounds and a voice memo.
- Look for
- Distortion, abnormal volume or unclear recording.
- Does not prove
- The state of every microphone in every app.
Buttons
- Test
- Volume, side, mute/Action depending on the model.
- Look for
- Physical response and on-screen confirmation.
- Does not prove
- Future durability of the mechanism.
Wi‑Fi and connectivity
- Test
- Connect to a network if possible and remove that network if you do not buy.
- Look for
- A stable connection during the test.
- Does not prove
- Carrier compatibility: that is checked separately.
LOCKS + PRIVACY
Carrier, MDM, IMEI and AppleCare: four different things
Do not group all the “About” screens into a single seal of trust. Each piece of data answers a different question.
Carrier lock
In Settings → General → About, “No SIM restrictions” («Sin restricción de SIM» on a phone set to Spanish) indicates that it is unlocked for other carriers. If a carrier appears, its use may be limited to that carrier. This is not Activation Lock.
Supervision / MDM
Check whether the iPhone shows as supervised, and check Settings → General → VPN & Device Management. If it belongs to an organisation or the management cannot be legitimately removed, do not treat it as a cosmetic detail.
IMEI and serial number
They are used to identify the device and check consistency. They are not a universal certificate of authenticity, legitimate ownership, absence of theft or a “safe purchase”. If a blacklist status depends on the carrier/country and there is no authorised source, it remains UNKNOWN.
AppleCare / coverage
It may matter for service and future cost, but active coverage does not prove that the seller is the legitimate owner or that the declared condition is correct.
IMEI: ••••••••••••123If you only need to compare consistency, hide most of the identifier and verify the full one in person when necessary.
Name: █████ · Address: █████An invoice can support provenance, but it does not need to expose the full address, email, phone number or tax details for an initial review.
DECISION
Final checklist: decide in layers, not on one signal
A reasonable purchase needs the hard-stops to be resolved and the remaining uncertainty to be compatible with your tolerance and the price.
The tests carried out are consistent with the listing and no outstanding material lock appears.
A material piece of data is missing. Ask for the specific proof before deciding.
There is evidence, but it does not resolve the doubt. Change the test, not the certainty.
Active Activation Lock or unresolved organisational management/ownership: do not close the purchase.
Barguvo can help you separate lock, identity, battery, repairs and evidence without turning a signal into a certificate.
A worn battery or a repair does not always invalidate the purchase; they change the context and the cost you should accept.
FAQ
How do I know whether a second-hand iPhone is ready to buy?
It must be possible to erase and activate it without it asking for the previous owner’s Apple Account; then check the model, battery, parts, carrier lock, supervision/MDM, physical condition and functions. No single screen certifies the whole purchase.
Does a clean IMEI mean the iPhone is genuine and safe?
No. The IMEI identifies the device and can be useful for carrier or support checks, but it is not a universal certificate of authenticity, legitimate ownership or absence of problems. If an external status has no authorised source applicable to your country/carrier, treat it as UNKNOWN.
Is a battery below 80 % a bad buy?
There is no universal PASS/FAIL. Apple uses 80 % as a design reference after a certain number of cycles under ideal conditions —500 on iPhone 14 and earlier, 1000 on iPhone 15 and later—. For buying, battery life, system messages, cycles where available and replacement cost also matter.
What extra data does the battery of an iPhone 15 or later show?
With compatible software it can show the cycle count, manufacture date and first use in addition to health/capacity. Do not extrapolate those fields to all earlier models.
Does “Unknown part” mean the iPhone is fake?
No. Apple lists several possible causes: a non-genuine part, unexpected behaviour, an incomplete/unverified repair, a used part or a modification. It is a signal about that part/repair, not a verdict on the authenticity of the whole phone.
How do I check whether it is carrier-unlocked?
In Settings → General → About, check “Carrier Lock” («Bloq. de operador» on a phone set to Spanish). “No SIM restrictions” indicates that the iPhone is unlocked for other carriers. This lock is different from Activation Lock.
Should I sign in with my Apple Account to test it?
Not before buying. To verify that it is no longer linked to the previous owner, it is enough to move forward in setup without it asking for their credentials; the buyer’s Apple Account can be set up later.
Should I test that it is water-resistant?
No. Water and dust resistance is not permanent and may decrease with use, impacts or repairs. Do not submerge a used iPhone to “check” its IP rating; inspect for signs of damage and repairs.
Does AppleCare prove that the seller is the owner?
No. AppleCare or active coverage provides service context, but it does not prove legitimate ownership, physical condition or that the listing description is correct.
What should I do if supervision or an MDM profile appears?
Ask about its origin and require any organisational management to be legitimately removed before closing. Barguvo does not recommend bypassing MDM, Activation Lock or carrier locks.