How to choose · Second-hand and refurbished
How to buy a used smartphone or laptop safely
Last updated 25 October 2026 · 2 sources listed · Reading time about 3 minutes
Short answer
Buy a used device by verifying that it is unlocked, not reported lost or stolen, and not tied to the previous owner's account, then testing battery health, screen, ports and performance before paying. Prefer sellers who offer a return window and written condition grades. Software support lifespan matters, because a device that no longer receives security updates is a growing risk.
Who this is for: A shopper considering a pre-owned phone or laptop from a marketplace, retailer or individual who wants to avoid locked, stolen or failing devices.
What to evaluate
Account and lock status
Devices still linked to a previous owner's cloud account or a carrier lock can be unusable or remotely disabled.
How to check: Ask the seller to sign out of accounts, erase the device in front of you and confirm it is unlocked.
Stolen or blacklisted devices
Buying a device reported stolen can mean it is blocked on networks and could be confiscated.
How to check: Check the serial or IMEI against official lost-device databases where available and ask for proof of purchase.
Battery and wear
Battery capacity declines with use, and a tired battery shortens daily usefulness and can swell dangerously.
How to check: Check battery health reports in the settings and look for swelling, gaps or a bulging case.
Software support
Manufacturers stop providing security updates after a period, leaving older devices vulnerable.
How to check: Look up the support window for the exact model before buying.
Condition grading and testing
Grades such as good or fair vary between sellers and are not standardised.
How to check: Ask for photographs, a written definition of each grade and test screen, camera, speakers, ports and radios.
Return window and warranty
A short return window allows you to find faults that hide on first inspection.
How to check: Prefer sellers with a stated returns policy and a limited warranty on refurbished items.
Comparison
| Source | Good when | Watch out for |
|---|---|---|
| Manufacturer certified refurbished | You want tested hardware with a warranty | Limited stock and less discount than informal sources |
| Specialist refurbisher | You want variety and graded stock with a returns policy | Grading differences and unclear parts replaced |
| Peer-to-peer marketplace | You can inspect in person and negotiate | Scams, stolen goods and no recourse |
| Trade-in resale by a retailer | You want convenience and some assurance | Limited detail on history |
Decision worksheet
Rate up to three options against this guide’s own criteria. It runs in your browser and saves only on this device. It is a thinking aid, not a recommendation.
1. Have you checked each criterion?
0 of 6 criteria checked.
2. Compare options (0 = fails or unknown, 3 = meets it well)
| Criterion | |||
|---|---|---|---|
| Account and lock status | |||
| Stolen or blacklisted devices | |||
| Battery and wear | |||
| Software support | |||
| Condition grading and testing | |||
| Return window and warranty | |||
| Total (max 18) | 0 | 0 | 0 |
Questions to ask before you commit
- Is the device unlocked and free of any account lock?
- Can you provide proof of purchase and the serial or IMEI?
- What is the battery health?
- Which parts have been replaced and are they original?
- Is there a returns window and warranty?
- How is condition graded and what do the grades mean?
- Are the charger and accessories safe and compatible?
- Will the model still receive security updates and for how long?
Typical trade-offs
Certified refurbished
- Upside
- Warranty and testing
- Downside
- Higher price than informal sources
Private sale
- Upside
- Lowest price and negotiation
- Downside
- No recourse and risk of fraud
Older flagship
- Upside
- Strong hardware for the money
- Downside
- Shorter remaining software support
Common mistakes
- Paying before checking account locks and resetting the device.
- Ignoring the end of software support for the model.
- Accepting a charger from an unknown source that may be unsafe.
- Buying from a seller who will not show proof of purchase or meet in a public place.
- Assuming all graded condition descriptions mean the same thing.
Related questions
How can I check whether a phone is reported stolen?
Use the device's serial number or IMEI, found in settings or on the box, and check with the carrier or national lost-device databases where they exist. Ask the seller for proof of purchase and a factory reset in front of you. Be wary of sellers who refuse or rush. If a device is later blocked, you may lose both device and money, so avoid purchases that cannot be verified.
What is the difference between refurbished and used?
Used usually means resold as it is with no repair. Refurbished means tested, repaired as needed and cleaned, often with a warranty, but definitions differ between sellers. Ask what testing was done, which parts were replaced, whether replacement parts were original and what warranty applies. Manufacturer programmes tend to have stricter standards than independent resellers, though quality varies in both groups.
How do I check battery health?
Most phones and laptops show battery condition in their settings or through built-in diagnostics, though format varies by maker. Look for reported capacity and cycle count if available. Physical swelling, a lifting screen or a case that does not close are red flags requiring immediate return. Ask whether the battery has been replaced and whether the replacement is genuine.
How long will an older device stay secure?
Manufacturers publish update policies or you can infer them from patterns, and each model has an end date after which security fixes stop. Using a device beyond that point increases risk, especially for banking and email. Check the model's support window before buying and consider the remaining time against your needs. Cyber security agencies advise replacing devices that no longer receive updates.
Sources and further reading
These pages were reachable when we last checked. They informed definitions and rules referred to above; they do not endorse this guide. Where rules differ by country, check the authority for your location.
- Consumer advice — Federal Trade Commission, retrieved 27 October 2026
- Consumer protection rights — GOV.UK, retrieved 27 October 2026
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