Key Takeaways
- Always test a secondhand device in person before handing over any money.
- Check that the device is not locked to a carrier or tied to a previous owner's account.
- Physical damage to ports and screens often signals deeper internal wear.
- Battery health is one of the most important — and most overlooked — things to verify.
- A factory reset should be performed before you use any secondhand device as your own.
Summary
22 items · 20–45 minutes
Why Secondhand Devices Deserve a Close Look
Buying a used phone, tablet, or laptop can stretch your budget significantly — but only if the device actually works as expected. Sellers aren't always upfront about every flaw, and problems that aren't obvious at a glance can turn a bargain into an expensive headache within weeks.
This checklist walks you through the key things to inspect before you commit. Work through it whether you're buying from a stranger on a local marketplace, a friend, or an online reseller. If a seller won't let you run these checks in person, treat that as a red flag. You'll want the device powered on and in your hands for most of these steps.
If you're buying a secondhand device for a child, also see our guide on setting up a child's first device — there's important configuration to do before handing it over.
Never Buy Without a Hands-On Test
Avoid purchasing any secondhand device sight unseen, even if photos look good. Photos can hide screen damage, mask slow performance, and say nothing about account locks. If an online seller refuses to meet in person or provide a live video call showing the device in use, it is safer to walk away. Deals that seem unusually cheap relative to market value warrant extra caution.
What You'll Need for the Inspection
Most of these checks require nothing more than your eyes and a few minutes. A couple of tools will help you go deeper:
A charging cable compatible with the device
Test that the charging port works and that the device can actually accept a charge.
A SIM card (if checking a phone)
Verify the device is not carrier-locked and that the SIM tray opens and functions correctly.
A pair of wired headphones
Test the headphone port and audio output quality if the device has a headphone jack.
A bright flashlight or phone torch
Illuminate the screen and ports closely to spot hairline cracks, debris, or corrosion not visible in normal light.
The Full Inspection Checklist
Work through each group in order. The physical and account checks come first because they're quick deal-breakers — no point testing the camera if the device is locked to someone else's account.
Account & Activation Locks
Physical Condition
Battery Health
Core Functionality
Software & Storage
Check for Stolen Device Reports First
A device that has been reported stolen can be remotely disabled by the original owner or the manufacturer — even after you've paid for it and taken it home. Before buying any used phone, ask the seller for the IMEI number (dial *#06# on any phone to display it) and check it against a free IMEI checker or the carrier's blacklist lookup. This single step can save you from owning a device that stops working without warning.
After You Buy: First Steps
Once you've agreed on the purchase and paid, don't skip these final actions before you start using the device as your own.
First, perform a full factory reset — even if the seller says they've already done one. This ensures no personal data, accounts, or apps from the previous owner remain on the device. On most phones and tablets, you'll find this option under Settings > General > Reset (iPhone) or Settings > System > Reset options (Android). On a Windows laptop, look for Settings > System > Recovery.
Next, run a software update immediately. Secondhand devices often miss months of security patches, which can leave you exposed. Our guide on keeping your personal devices secure covers the habits that matter most after setup.
If the device starts behaving strangely after purchase, work through our tech support pre-check list before spending money on a repair. And if you're curious why the device might feel slower than expected, understanding why devices slow down over time explains what's happening inside.