Questions to Ask When Buying a Used Phone
For anyone buying a second-hand phone from a private seller, a marketplace listing or a refurbished-phone shop. The groups follow the order of the purchase: ownership and locks, the model and your network, and condition can all be asked by message, then come the tests to run in person, what to ask a refurbished shop, and price and payment. Every note says which answers are reassuring, which are not, and what to check for yourself.
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The questions
Each question, and why to ask it
Ownership and locks
Are you the first owner, and when and where did you buy it?
Why ask it
A first owner who can name the store and the month can answer for everything else on this list. Someone who bought it used a few weeks ago can only repeat what they were told, so the checks you run yourself count for more. A phone that was a gift or a prize is not suspicious in itself, but there will be no receipt to lean on, so the IMEI and account checks have to carry the weight.
Is the phone fully paid off, or is it still on a payment plan or contract?
Why ask it
With some carriers, a phone that is still being financed can be blocked if the original owner stops paying, and that can happen months after you bought it. A good answer comes with evidence: the account page showing nothing owed, or a paid-in-full message from the carrier. Treat a promise to finish the payments after the sale as a no.
Is it locked to a carrier, or will it take any SIM?
Why ask it
Sellers use the word unlocked loosely, sometimes meaning only that the screen has no passcode. Some phones state the lock status in settings, and the firmer proof is your own SIM making a call. If it is locked, ask that carrier what it requires to unlock a phone for a new owner, because the rules differ by carrier and by country.
What is the IMEI, and can I check it before we meet?
Why ask it
Dialing *#06# brings up the IMEI on almost every phone, so ask for a screenshot of that screen, since a label on a box only tells you about the box. Then find out which checker applies where you live, since carriers and some national registries each run their own, and enter it there. Some honest sellers are cautious about sending the number to a stranger; offering to check it together when you meet is a fair compromise.
Have you signed out of your Apple, Google or Samsung account and switched off the find-my feature?
Why ask it
These accounts put a lock on the phone that survives a reset, and a phone that still asks for the previous owner's sign-in is of no use to you. The seller has to sign out with their own password, which takes a minute if the phone is theirs. 'I forgot the password' or 'I will remove it remotely tonight' is where you stop.
Has it ever been reported lost or stolen, or blocked on any network?
Why ask it
The seller will say no, so the value is in what you do next: run the IMEI yourself and keep a screenshot of the result with the date. A clean check only describes today, since a report can be filed later. That is why the receipt, the seller's name and the message thread are worth keeping.
Do you have the receipt or order confirmation, and can I see it beside the phone?
Why ask it
A receipt shows the purchase date and the model, and many carry the serial number or IMEI, which you can match against the phone's settings. No paperwork for a four-year-old phone is ordinary. No paperwork for one sold as nearly new is worth a second question, and a photo with the personal details covered is a fair thing to ask for.
Why are you selling this phone, and what are you using now?
Why ask it
An upgrade is the usual reason, and the seller will often have the newer phone in their hand when you meet. Listen for an answer that does not fit, like selling it for a relative who cannot come, or a nearly new phone with no replacement in sight. Neither settles anything, but both are reasons to be strict about the IMEI and account checks.
Was it ever a work or school phone, or enrolled in device management?
Why ask it
A phone registered to an organization can ask for that organization's sign-in after a reset, and only its IT department can release it. Look in settings for a management profile, and watch during setup for a line saying the device is managed. If either shows up, treat the phone as not ready to sell until the organization has released it.
Has it ever been replaced under warranty or an insurance claim?
Why ask it
A replacement unit explains why the serial number on the receipt differs from the one in settings, so a yes with paperwork is fine. The answer to worry about is a phone that was claimed as lost or broken and then kept: insurers and carriers may block those, sometimes long after the claim. Ask to see the email or repair note that came with the replacement.
Model and network
Which exact model and storage size is it, and can you send a screenshot of the About screen?
Why ask it
Listings get storage sizes wrong and sometimes the model too, and the price difference between two sizes can be large. The About screen in settings shows the model name, the model number, the capacity and the serial number in one place. Type the model number into the maker's site to confirm what it is and which region's version you are looking at.
Was it sold in this country, or is it an import from another region?
Why ask it
Versions made for other regions can differ in the network bands they support, the SIM arrangement and whether the maker's local service centers will repair them. An import is not a bad phone, but the price should reflect it. Ask the maker's support how warranty and repairs work for that model number where you live.
Will this model work on my carrier, including 5G and calling over Wi-Fi?
Why ask it
Unlocked and compatible are separate things. Carriers use different frequency bands, and a version built for another market can connect but with weaker coverage or without some features. Give your carrier the exact model number, or use its compatibility checker if it has one, and trust that over 'it works on everything'.
Does it take a physical SIM, an eSIM or both, and has your eSIM been removed?
Why ask it
Some regional versions have no SIM tray at all and others have no eSIM, and your carrier may issue only one of the two. Settle that with your carrier before you fall for a listing. A leftover eSIM belongs to the seller's line, so make sure it is gone from the SIM settings after the reset.
Which software version is it on, and is this model still getting security updates?
Why ask it
Several makers publish how long each model will get updates, and for the rest, how long earlier models were supported is the best guide. A phone past that date keeps working but stops getting fixes, and over time banking and payment apps may refuse to run on software that old. Look up the end date for the model and count how many years you would get for your money.
Has it been jailbroken, rooted or had unofficial software installed?
Why ask it
A modified phone may stop receiving updates the normal way, and some banking, payment and streaming apps look for the change and will not run. Ask the seller to put the maker's own software back before the sale, then open the update screen in settings and see that it checks and reports as usual. On some Android phones, unlocking the bootloader leaves a permanent record the maker's service staff can read, so ask the maker what that means for repairs on that model.
Is there any warranty or care plan left, and does it move to me?
Why ask it
Several makers will show remaining coverage on their site if you enter the serial number, so the seller's answer can be checked in a minute. Whether a paid care plan transfers to a new owner depends on the plan and the provider, so put that question to the provider, whose answer is the one that counts. Remaining cover is worth paying a little more for once you have confirmed it yourself.
Condition
Has it had any hard drops, and has it lived in a case with a screen protector?
Why ask it
Most phones get dropped at some point, so 'never' from a two-year owner is harder to believe than 'twice, in its case, and nothing broke'. Listen for a fall that was followed by a repair or a fault: a screen changed soon after, a dented corner, a camera that started to rattle. A phone that went bare for years shows it on the frame and around the camera ring, so ask for close photos of both.
Are there cracks, chips or deep scratches anywhere, including under the case and the screen protector?
Why ask it
Ask for photos with both taken off, in daylight, of the front, the back and all four edges. A protector can hide a crack completely, and a hairline crack in back glass or a camera lens cover is a way in for water and dust. Light scuffs on the frame are cosmetic; damage at the corners suggests a hard landing.
What does the battery health screen say, and can you send a screenshot taken today?
Why ask it
iPhones show a maximum capacity percentage in the battery settings. Android phones vary: some show a figure in settings or in the maker's diagnostics app, and some show nothing, in which case the seller's account of a normal day is what you have. The lower the number, the sooner you pay for a battery, so get the maker's replacement price and count it in.
How long does a full charge last on a normal day, and does it ever switch off with charge left?
Why ask it
'I charge it at lunch as well' is a more honest measure than any percentage. Shutting down at twenty or thirty percent, especially in the cold or when the camera opens, points to a battery near the end of its life. A battery can be replaced, so take the cost of one off your offer and carry on.
Has the battery been replaced, and who did the work?
Why ask it
A new battery fitted by the maker or an authorized shop, with an invoice, is a point in the phone's favor. One fitted at a market stall may be fine or may not, and on some models a non-original battery makes the phone show a warning and hide the health reading. Ask for the invoice, and look at the health screen for any message about the part.
Has the screen been replaced, and was the new one an original part?
Why ask it
Third-party screens range from good to noticeably dimmer, with duller color and touch that misses light taps. On some models a replaced screen also disables a feature such as automatic color adjustment or the fingerprint reader. Recent iPhones list replaced parts on the About screen and say whether each is genuine; for other makes, ask where a parts history is shown.
Has anything else been opened or swapped, such as the back glass, a camera, the charging port or the frame?
Why ask it
Repairs are ordinary on a phone a few years old. What you want is who did the work, when, and a receipt. Signs of an undocumented repair are gaps along the edge of the screen, glue residue, mismatched screws beside the charging port and a camera that will not focus.
Has it ever gotten wet: a pool, a sink, heavy rain, a spilled drink?
Why ask it
A water resistance rating describes a new phone, and seals weaken with age and after any repair that opened the case. Many phones have a small indicator inside the SIM tray slot that changes from white to red or pink after contact with liquid, so shine a light in and look. Corrosion can take weeks to cause trouble, which is why a phone that 'dried out fine' deserves a lower offer or a pass.
Is there any burn-in, tint, dead pixel or bright patch on the screen?
Why ask it
Have the seller send photos of a plain white image and a plain gray one at full brightness. Burn-in shows as a faint ghost of the keyboard or the status bar, a pressure mark as a bright blotch, and a failing panel as a green or pink line or tint. Check again in person in a dim corner, where uneven patches are easier to see.
Is there anything that does not work, or that works only some of the time?
Why ask it
Name the usual suspects yourself so a vague no is harder to give: a speaker, a side button, face unlock, one camera lens, charging that needs the cable held at an angle. Intermittent faults rarely appear in a ten-minute meeting. Put the question in the message thread, so the answer is in writing if the fault shows up in your first week.
Does it come with the original box, a charger and a cable?
Why ask it
A box whose label matches the phone's IMEI is a small piece of evidence that the seller bought it. A missing charger is common, since many phones no longer ship with one, so add the cost of a decent one from the maker or a known brand. Unbranded chargers thrown in for free are better left behind.
Testing in person
Can we meet somewhere with Wi-Fi and a power outlet, and can I have fifteen minutes with it?
Why ask it
Say how long you need when you arrange the meeting, so nobody is surprised when you start pressing buttons. A cafe, a mall or the lobby of a busy store gives you light, power and other people around. Someone who will only do a quick handover through a car window has told you how much testing they expect.
Does the IMEI on the screen match the SIM tray, the box and the receipt?
Why ask it
Not every model prints the number on the tray or the back, but where it does, every copy should agree with the one in settings. A mismatch means the box came from another phone, or the housing or main board has been swapped. Dual-SIM phones show two IMEIs, so compare the right pair before you decide something is wrong.
May I put my own SIM in and make a call?
Why ask it
One call tests the carrier lock, the earpiece, the microphone and the signal together. Ring someone who will tell you honestly how you sound, switch to speaker halfway through, then turn Wi-Fi off and load a web page on mobile data. Bring a SIM ejector pin or a paper clip, because sellers rarely carry one.
Does it lie flat on the table, and does the screen sit flush with the frame all the way around?
Why ask it
Put it face down and press each corner: rocking means a bent frame. A screen or back panel lifting along one edge can mean a swollen battery. That is a safety problem, so do not press on it or charge it, and do not take the phone at a discount either.
Does the touchscreen respond everywhere, right out to the corners?
Why ask it
Hold an app icon and drag it slowly around the whole screen, edges included. Wherever the touch layer is dead, the icon drops. Then type a couple of sentences on the keyboard: missed or phantom letters are the usual complaint with a poor replacement screen.
Do all the cameras focus, front and back, and does the flash fire?
Why ask it
Switch through every lens and photograph some small print up close and a sign across the room. Haze, specks that stay in the same spot, a lens that hunts without settling or a buzzing sound from the camera are all faults, and the last often points to a damaged stabilizer. Record ten seconds of video and play it back, which checks the microphones too.
Do the speakers, the microphones, every button and the vibration all work?
Why ask it
Play music at full volume and listen for crackle or one side quieter than the other, then record a voice memo and play it back. Press each button several times, flip the mute switch if there is one, and feel for a click every time. Set the phone to vibrate and call it.
Do Wi-Fi, Bluetooth and GPS each connect while I watch?
Why ask it
Each has its own antenna, and a drop or a careless repair can knock out one while the rest carry on. Join your hotspot, pair your own earbuds, and open a map outdoors to see whether it finds you within a minute or so. If you pay by tapping your phone, ask how the contactless chip can be tested on that model.
Can I plug in my own charger and cable and watch the percentage climb?
Why ask it
The plug should seat firmly and keep charging when you nudge it. A cable that only works at one angle means a worn or dirty port, and pocket lint is the cheap version of that problem. If the model charges wirelessly and you own a pad, bring it, since the charging coil is a separate part and a back glass repair can disturb it.
Is there a diagnostics menu or test app for this model that we can run together?
Why ask it
Several makers build in a test screen or offer a diagnostics app that steps through the display, sensors, speakers and buttons. Look up how it works for the model before you go, so you are not relying on the seller to find it. A shop should have run its own checks already and can show you that report.
Can we do the handover at my carrier's store?
Why ask it
Call the store first and ask what it is willing to do, because some will check the phone and activate it on your line and others will not get involved. An activation that goes through is strong evidence the phone is not blocked today. A refusal proves nothing, since it is an extra trip for the seller, but it leaves the SIM call and the IMEI check to do all the work.
Will you erase it in front of me so I can set it up to the home screen?
Why ask it
Watching the reset matters less than what comes after it. Join your own hotspot, go through setup, and make sure it never asks for an earlier owner's account or shows an organization's name. Only a phone that reaches the home screen without asking for anyone else has passed.
Can I set up the fingerprint reader or face unlock for myself?
Why ask it
Do this after the reset, when you are going through setup anyway. On some models these sensors are paired to the original parts and stop working after certain repairs, which is expensive or impossible to put right. If enrollment fails or the option is grayed out, assume a hardware fault whatever explanation is offered.
Refurbished shops
Who refurbished this phone, and what was actually done to it?
Why ask it
The word has no single meaning. It can be the maker replacing the battery and the shell and testing everything, or a reseller wiping the phone and cleaning the screen. A good answer lists the tests run and the parts changed on this unit, and a vague one tells you the work was light.
What does your grade mean for the screen, the body and the battery?
Why ask it
Grades are each seller's own invention, so one shop's 'excellent' can be another's 'good'. Ask for the written definition and check whether it says anything about the battery, because many grades describe looks only. If the description allows scratches on the screen, ask whether they are visible with the display on.
Is there a minimum battery health you sell at, and are replacement parts original?
Why ask it
Many refurbishers state a floor for battery capacity, and the useful follow-up is the figure for the unit you would receive. Where a battery or a screen has been replaced, ask whether the part is the maker's and whether the phone will show a parts warning. A third-party part is not a deal-breaker at the right price, as long as you learn about it before you pay.
Is the photo in the listing of this exact phone, or a stock picture?
Why ask it
Large refurbishers sell by grade and use stock photos, which is fine when the return policy is generous. A small shop or a marketplace seller should be able to photograph the actual unit with the screen on. If neither real photos nor easy returns are on offer, you are buying blind.
How long is the warranty, who honors it, and what does it leave out?
Why ask it
Find out whether a fault goes back to the shop, to a separate warranty company or to the maker, and who pays the postage. Battery wear, cosmetic marks and accidental damage are often excluded, so read the list. Your rights with a business seller also depend on where you live, so look up what the consumer rules there say.
How many days do I have to return it, and is there a restocking fee?
Why ask it
Ask whether the return window covers a change of mind or only a fault, and when the clock starts for an online order. Then use the time: run every check from the Testing in person group in the first two days, not on the last one. Where the window is short and there is a fee, do your comparing before you order, because changing your mind will cost you.
Will the receipt show the IMEI, the grade and the warranty terms?
Why ask it
A receipt with the IMEI on it is your proof of purchase if a carrier ever questions the phone or it needs a warranty repair. It also ties the shop to the grade it sold you. If the invoice would say only 'used phone', ask for the IMEI and grade to be added before you pay.
Price and payment
What is the lowest you would take if it passes every check in person?
Why ask it
Before you meet, look at what the same model, storage and condition has actually sold for, and at what a shop charges for a refurbished one with a warranty. A private sale with no warranty should come in clearly below the shop price. Keep your number to yourself until the testing is done, when a tired battery or a scratched lens gives you a specific reason for it.
If it turns out to be blocked or locked in the first week, will you take it back?
Why ask it
Private sales are usually final and what protection exists varies by place and by platform, so this is about the person more than the rules. A seller who says yes in the message thread is showing some confidence in the phone. On a marketplace, read the buyer protection terms for what they cover and how quickly you must report a problem.
Will you write a short bill of sale with your name, the date, the price and the IMEI?
Why ask it
Two handwritten lines and a signature are enough, or a message that states the same facts. It will not fix a bad phone, but it shows when and from whom you bought it if a carrier, an insurer or the police ever ask. Most people selling their own phone do not mind, so a refusal to put a name to the sale stands out.
How do you want to be paid, and can it be a method that leaves a record?
Why ask it
In person, pay only after the tests and the reset, with cash counted in front of the seller or a transfer you both see arrive. For anything shipped, stay inside the platform's checkout, where its buyer protection applies. Requests for gift cards, a wire, or a transfer marked as going to friends and family are a common pattern in scams, and no discount makes up for them.
If you are mailing it, will you send it tracked and insured, and photograph the IMEI screen first?
Why ask it
Tracking and insurance protect both sides, and the photo fixes which phone was sent. When the parcel arrives, film yourself opening it and compare the IMEI with the listing before you do anything else. Dispute windows can be short, so do your testing that day.
How to check a used phone before you pay
Practical guidance for the conversation itself
Before you reply to a listing
Price the model three ways
Look up what the same model and storage has recently sold for used, what a refurbished one with a warranty costs, and what the maker charges to fit a new battery. Those three numbers tell you whether a listing is fair. A price far under all the others needs an explanation before it earns a meeting.
Check it against your carrier
Take the exact model number from the listing to your carrier's compatibility page or support line. Ask about bands, 5G, eSIM and Wi-Fi calling, and ask how that carrier treats a second-hand phone that someone else financed.
Learn where the checks live on that model
Spend five minutes finding where that phone shows battery health, lock status, parts history and the IMEI, and whether it has a diagnostics mode. At the meeting you want to go straight to those screens without being guided there by the seller.
Ask the deal-breakers by message
Everything in Ownership and locks can be settled before you travel: who owns the phone, whether it is paid off, the carrier lock and the account sign-out. Answers in a message thread are also a record, which answers given on a street corner are not.
At the meeting
Pack a small test kit
Your own SIM and an ejector pin, a charger and cable you know are good, earbuds, and a second phone to act as a hotspot and take a test call. A power bank covers you if there is no outlet.
Work in a fixed order
Match the IMEI first, then make the SIM call, then go through the screen, cameras, sound, buttons and charging. Leave the sign-out and the reset for last: there is no point wiping a phone that has already failed, and the seller keeps their data until you are nearly sure.
Let the seller do the sign-out
They enter their own password to leave the account and start the erase. You handle setup afterwards. If the phone asks for anyone else's details on the way back to the home screen, hand it back.
Pay last, and record what you bought
Money moves after the phone has reached the home screen and passed your tests. Before you part, photograph the IMEI screen and keep it with the messages and any bill of sale.
Private seller, marketplace or shop
What a private sale gives you
Usually the lowest price, and the chance to test this exact phone before paying. What it tends to lack is any comeback afterwards, so the testing has to be complete.
What a marketplace adds
On platforms that have one, a checkout with buyer protection, plus a record of the listing, as long as you pay inside it. Read what the protection covers and its deadline, and be suspicious of a seller who wants to finish the deal somewhere else.
What a refurbished shop adds
Testing, a grade, a return window and a warranty, in exchange for a higher price and often a phone you cannot see until it arrives. Shops differ mostly in their battery policy and in how honest their grades are.
Putting the prices on the same footing
Add a new battery to the private price if the health reading is low, and a charger if none is included. Then set that total beside the shop price with its warranty. The gap is often smaller than the listings make it look.
When to walk away
The account will not come off
A forgotten password, a promise to remove the lock later, or an organization's name on the setup screen. None of these is something you can fix after the sale.
The numbers do not agree
An IMEI that differs between the screen, the tray and the paperwork with no replacement record to explain it, or a seller who will not show the number at all.
A swollen or lifting phone
A screen or back rising from the frame can mean a swollen battery. Do not charge it, do not press it flat, and do not buy it at any price.
Hurry and unusual payment
Pressure to skip the tests, to meet somewhere with no light or signal, or to pay by gift card or wire before the phone is in your hand. A good phone at a fair price survives fifteen minutes of checking.