Why Used and Refurbished Phones Deserve Extra Scrutiny

Buying a secondhand smartphone can stretch your budget considerably — a device that launched at a premium price may be available for significantly less after a year or two of use. But unlike new devices, used and refurbished phones carry histories you can't always see. Hidden faults, locked carrier agreements, and inflated condition grades are among the pitfalls buyers encounter.

Understanding what to look for — and in what order — makes the difference between a smart purchase and an expensive regret. This checklist walks you through every major verification step, from confirming a device's identity to evaluating physical wear. For a deeper understanding of what the spec numbers on any listing actually mean, see our guide on what smartphone specs actually mean.

Before you start, it's also worth understanding how condition labels like 'certified refurbished' and 'seller refurbished' differ — they are not interchangeable standards. Our guide to open-box and refurbished condition labels explains what each designation actually covers.

Condition Grade Labels Are Not Standardised

Terms like 'Grade A', 'Excellent', or 'Like New' are defined differently by each seller and platform. One seller's Grade A may permit visible scratches that another would classify as Grade B. Always read the specific condition description rather than relying on a grade label alone, and request photos of the actual unit — not stock images — before purchasing online.

How to Use This Checklist

Work through these groups in order. The first two sections — identity and software — are non-negotiable filters. If a device fails those checks, the physical and performance steps that follow are irrelevant. Items marked must are deal-breakers if skipped; should items are strongly recommended; nice to have items add confidence but aren't essential.

Bring this checklist whether you're buying in person or evaluating a listing remotely. For in-person purchases, request enough time to complete the physical and functional checks — a reputable seller will not object. For online purchases, treat the return policy check as a prerequisite before committing funds.

If you're comparing used phones against a new budget device, our breakdown of budget vs. mid-range vs. flagship phone differences can help you decide which tier genuinely meets your needs.

Required

IMEI Verification Service

Used to check whether a device's IMEI has been reported stolen, blocked by a carrier, or flagged in international databases.

Required

Manufacturer Diagnostic Mode

Built-in hardware test menus available on many Android devices (accessed via dial codes) to check sensors, display, and speakers systematically.

Optional

Battery Health App (Android)

Third-party diagnostic tools help surface battery cycle counts and health metrics on Android phones that lack a native battery health screen.

Optional

SIM Card from Your Carrier

Insert your own active SIM during an in-person inspection to confirm the device accepts your network and establishes a signal.

Identity and Legal Status

Locate the IMEI number by dialing *#06# and cross-check it against the IMEI printed on the device's packaging or settings menu. Must
Run the IMEI through a reputable stolen-device database (such as the GSMA's IMEI check service) to confirm it has not been reported lost or stolen. Must
Confirm the device is not carrier-locked, or verify it is locked to a carrier you actually use. Must
Check that the IMEI on the device matches the IMEI on any included receipt or documentation. Should

Software and Account Status

Power on the phone and confirm it boots fully to a usable home or setup screen without looping or freezing. Must
Verify no previous owner's Apple ID (Activation Lock) or Google account is still logged in and actively protecting the device. Must
Check the current operating system version and confirm the device is still eligible for future software updates from the manufacturer. Should
Review whether the phone has been rooted (Android) or jailbroken (iOS), which can affect security and warranty. Should

Battery Health

On iOS, navigate to Settings > Battery > Battery Health and confirm the maximum capacity is 80% or above. Must
On Android, use a trusted diagnostic app or manufacturer's built-in battery menu to check cycle count and health status. Must
Factor in battery replacement cost if health is below 80% — add that estimate to the asking price before deciding. Should

Physical Condition

Inspect the screen under direct light for cracks, dead pixels, dark spots, or burn-in from prolonged static images. Must
Check all ports — charging port, headphone jack if present, and speaker grilles — for debris, corrosion, or damage. Should
Examine the frame and back panel for bends, chips, or signs of liquid damage (look for discoloured liquid damage indicators near the SIM tray). Should
Test all physical buttons — volume, power, and mute or fingerprint sensor — to confirm responsive operation. Should

Functional Testing

Test the front and rear cameras by taking photos and a short video, checking for blur, focus issues, or sensor damage. Must
Make or receive a test call to confirm microphone, earpiece speaker, and cellular connectivity work correctly. Must
Connect to a Wi-Fi network and verify stable connectivity; test Bluetooth pairing with a nearby device. Should
Test Face ID, fingerprint sensor, or PIN unlock to confirm the biometric authentication system functions reliably. Should

Seller Terms and Documentation

Confirm the seller offers at least a 14-day return window for any reason, not just manufacturer defects. Must
Ask whether any warranty — even a limited 90-day one — is included, and get the terms in writing before purchase. Should
Request a receipt or proof of purchase that includes the IMEI, date of sale, and seller contact information. Nice to have

After You've Verified the Device

Once you've completed the checklist and are satisfied with the device, a few final steps set you up for a smooth handoff. Make sure the seller performs a factory reset in front of you — or that you can verify the device is signed out of any accounts — before you leave or accept delivery. Receiving a phone still linked to a previous owner's Apple ID or Google account can render it completely unusable.

For guidance on moving your contacts, photos, and apps to your newly acquired phone, our complete phone transfer guide walks through the full process on both Android and iOS. And if you're new to smartphones entirely, our first-time smartphone buyer's guide covers the broader decisions around operating systems, storage needs, and long-term usability.

Factory Reset Before First Use Is Non-Negotiable

A device that still has the previous owner's account credentials active can be remotely locked or wiped at any time — leaving you with an unusable device. Before completing any purchase, confirm the phone has been fully signed out of all accounts and perform a factory reset yourself if there is any doubt. Do not power down or accept the device until you have verified this step is complete.