Buying a used device from a stranger carries real risks: hidden damage, a carrier blacklist flag, an active Activation Lock you can’t remove, or a seller who disappears after the sale. None of those outcomes are inevitable. This checklist walks you through pre-purchase verification for any used device, so you know exactly what to confirm before money changes hands. Many of the steps in the article are already handled by Swappa staff when buying on Swappa so keep that in mind when reading through the process. This is a general guide when buying locally or possibly online.
Quick Answer
Before buying any used device, verify five things: the seller’s reputation, a clean IMEI or serial number, no active locks, acceptable condition and function, and a secure payment method. On a verified marketplace like Swappa, most of these checks are handled for you before a listing goes live. Browse used device listings on Swappa.
1. Verify the Seller
A good device from a bad seller is still a bad deal. Seller reputation is the first thing to check, and it takes less than two minutes.
If you’re buying on a marketplace:
- Check the seller’s transaction history and feedback score. Look for volume (not just one or two sales) and recent positive reviews.
- Read negative reviews. One dispute in fifty is different from a pattern of “not as described.”
- Confirm the seller communicates through the platform. Any push to move the conversation off-platform is a red flag.
- Avoid zero-feedback, newly created accounts selling premium devices at steep discounts.
If you’re buying locally (Craigslist, Facebook Marketplace, etc.):
- Meet in a public place, preferably one with security cameras (a bank lobby, police station parking lot, or busy coffee shop).
- Bring a friend if possible. Bring cash only if the deal is confirmed.
- Never wire money, use Zelle, or Venmo before you have the device in hand. Those transfers have no buyer protection.
On Swappa, listings are staff-reviewed before going live, and seller accounts are screened through AI fraud prevention. That does not eliminate the need to read the listing carefully, but it removes most of the guesswork on seller legitimacy.
2. Verify the Device Is Clean: Locks and IMEI
This is the check that saves you from buying a device you can’t use. A phone that can’t be activated, or a tablet locked to someone else’s account, is worth nothing regardless of how good it looks.
IMEI and serial number checks (phones and tablets): This step is not necessary on Swappa. Our staff does this part for you.
- Ask for the IMEI (phones) or serial number (tablets, laptops, other devices) before agreeing to buy.
- Run an IMEI check on a phone before purchase. A clean IMEI means the device is not reported stolen or carrier-blacklisted. A blacklisted phone may work on Wi-Fi but will not activate on a carrier network.
- Confirm the IMEI in the listing matches the IMEI on the physical device. On an iPhone, find it in Settings > General > About. On Android, dial *#06#.
- For phones, confirm the device is fully paid off. A phone still on a carrier payment plan may be blacklisted as soon as the seller stops paying.
Lock status:
- iPhones: Confirm Find My / Activation Lock is off. In Settings > [Your Name] > Find My, it should be toggled off. If you can’t access Settings, the seller should demonstrate it directly.
- Android phones: Confirm Factory Reset Protection (FRP) is cleared. The seller should sign out of their Google account completely before handoff. After a factory reset, if it asks for the previous Google account credentials, FRP is still active.
- iPads and Macs: Same Find My / Activation Lock check applies.
- Chromebooks: Confirm enterprise enrollment is not active.
- Gaming consoles: Confirm the console is not banned from online services (PlayStation Network, Xbox Live, Nintendo Network).
Swappa requires all listed devices to have a clean IMEI/ESN, be fully paid off, and have no active OS or activation locks as a condition of listing. Those aren’t suggestions. Listings that don’t meet those standards are not approved.
3. Verify Condition and Function
A clean device on paper still needs to work in your hands. Condition covers two categories: cosmetic (how it looks) and functional (how it works). Both matter, but functional issues are the ones that can cost you real money.
Cosmetic inspection:
- Check the screen for cracks, chips, or deep scratches. A few light hairline marks are normal on used devices. A cracked screen affects usability and resale value.
- Inspect the body for dents, broken ports, or missing pieces.
- Check for water damage indicators. On iPhones, the Liquid Contact Indicator (LCI) is in the SIM tray slot (white = no exposure, red/pink = water contact). Many Android devices have similar indicators.
- Look at the charging port for debris or bent pins.
Take a close look at all the photos on an online listing. If you don’t see an angle that you’d like to see, send the seller a message asking for additional photos.
Functional testing (run these before any payment):
- Power the device on fully from a cold start.
- Test the screen: tap and swipe across the whole display. Dead zones or unresponsive areas indicate screen damage.
- Test every button (volume, power, home button or Face ID / Touch ID if applicable).
- Check speakers and microphone (play audio, make a call or use voice memo).
- Test all cameras, front and rear.
- Connect to Wi-Fi. Test cellular signal if applicable.
- Check Bluetooth and any other connectivity you’ll use (NFC, GPS).
- Check the battery health. On iPhones, Settings > Battery > Battery Health and Charging shows the current maximum capacity. On Android, most manufacturers include battery health information in Settings or a diagnostic menu. Lower battery health is normal on used devices. Factor the cost of a potential replacement into your offer if health is significantly degraded.
Battery health note: Swappa requires a fully functional battery (one that properly charges and discharges) but sets no minimum percentage. iPhones with battery health below 80% where Apple’s battery message is showing in Settings must disclose that in the listing.
4. Verify What’s Included
“Like new” listings sometimes mean the device only, with no charger, cable, or accessories. Know what you’re paying for.
- Confirm what is included in the sale (charger, original cable, case, stylus, ear tips, etc.).
- Determine whether the original box is included. This rarely affects function but can affect resale value.
- For wireless earbuds and headphones: confirm the charging case is included. Without it, a set of earbuds is essentially unusable for regular charging.
- For laptops: confirm the power adapter is included and is the correct wattage. Third-party adapters are common and usually fine, but cheap knockoffs can cause charging issues or worse.
- For cameras: confirm lenses and batteries are included as listed.
- For drones: confirm batteries and a controller are included; confirm the drone is not on a no-fly restriction list from the manufacturer.
Missing accessories are not automatically a dealbreaker, but they should factor into the price you’re willing to pay. Replacement chargers and cables are inexpensive. Replacement styluses, camera lenses, or drone batteries are not.
5. Pay Safely
How you pay determines what recourse you have if something goes wrong. This is not a detail to skip.
- Pay through a method that offers buyer protection and dispute resolution. PayPal is the most common and offers both. Credit cards have chargeback rights but no marketplace-specific dispute process.
- Never pay via wire transfer, Zelle, Venmo (when used as a direct payment), cryptocurrency, or gift cards. None of these offer meaningful recourse if the seller disappears or the device is not as described.
- Do not pay before you have the device if buying locally. Do not hand over cash until you have run the checks above.
- Save all receipts, messages, and photos of the device at the time of purchase.
- Understand the return policy before buying. On Swappa, if a device is not as advertised, the buyer is entitled to a refund and the seller must accept the return. Buyer’s remorse returns are at the seller’s discretion.
Swappa processes payments through PayPal (available to all buyers and sellers) and Stripe (select sellers). Both provide buyer and seller protection. The buyer fee is a flat 3%, added to the ask price at checkout. Payment processing fees (PayPal: 3.49% + $0.49; Stripe: 2.9% + $0.30) apply on top of the listing price, along with applicable state sales tax.
Buying on a Verified Marketplace vs. Going It Alone
Running through this checklist yourself takes time, and some checks, like a thorough IMEI verification or a physical inspection, require access to the device. Buying through a verified marketplace shifts most of the pre-screening burden off you.
On Swappa, every listing is reviewed by staff before it goes live. Requirements include a clean IMEI/ESN, no activation or OS locks, no water damage, no cracked glass, a fully functional battery, and a device that is fully paid off. Human support is available 24/7/365 with a typical response time around 20 minutes. That is not the same as a perfect guarantee, but it is a different risk profile from buying off a classified listing.
Savings on used devices typically range from 30% to 60% off new prices, though this varies by category and individual listing. Prices fluctuate with supply, demand, and new model releases. Browse current used device prices and live listings at swappa.com/buy.
Summary Checklist Table
| Check | What to Look For | Where It Can Go Wrong |
|---|---|---|
| Seller reputation | Transaction history, feedback, communication | Fake accounts, no-history sellers |
| IMEI / serial | Clean, not blacklisted, matches device | Stolen, carrier-locked, financed |
| Activation Lock / FRP | Fully disabled before purchase | Bricked device, no activation |
| Condition (cosmetic) | Screen, body, ports, water indicator | Hidden damage in photos |
| Condition (function) | Screen, buttons, audio, cameras, connectivity | Non-disclosed hardware faults |
| Battery health | Functional; check % on iPhones | Rapid drain, won’t hold charge |
| What’s included | Charger, accessories, case as listed | Missing items, wrong wattage adapter |
| Payment method | Buyer protection, dispute resolution | No recourse on Zelle/wire/crypto |
FAQ
What should I check before buying a used phone?
Check the IMEI to confirm it is not blacklisted, verify that Find My (iPhone) or Factory Reset Protection (Android) is fully disabled, inspect the screen and body for damage, test all core functions, confirm battery health, and pay through a method with buyer protection.
How do I check if a used iPhone has Find My still active?
Ask the seller to show you Settings > [Their Name] > Find My on the device. If Find My is toggled on, the device is still linked to their Apple ID. The seller must sign out of iCloud before the sale. If you complete a purchase and discover Find My is still active, the device will prompt for the previous owner’s Apple ID credentials after a factory reset, making it unusable.
Is it safe to buy used electronics online?
Yes, with the right checks. The main risks (stolen devices, hidden damage, no recourse on payment) are all manageable. Using a verified marketplace with staff-reviewed listings and PayPal-backed buyer protection reduces those risks significantly compared to cash-only local sales or unverified classifieds.
What does a clean IMEI mean?
A clean IMEI means the phone has not been reported stolen, is not on a carrier blacklist, and is not flagged by the original carrier. A phone with a dirty or blacklisted IMEI may work on Wi-Fi but cannot activate on a carrier network. Check the IMEI before purchasing any used phone.
What is Factory Reset Protection (FRP) and why does it matter?
FRP is Google’s anti-theft feature for Android devices. After a factory reset, the device requires the Google account credentials that were signed in before the reset. If a seller does not sign out of their Google account before handing over the device, you will be locked out after any reset. Always confirm the seller has signed out of all Google accounts before purchase.
What accessories should come with a used device?
It depends on the device type, but at minimum: a charging cable and adapter for phones and tablets, the charging case for wireless earbuds, a power adapter for laptops, and the original remote for streaming devices. Confirm what is included in writing before buying. Missing accessories are common and not a dealbreaker, but they should factor into the price.
Conclusion
Pre-purchase verification is not complicated, but skipping steps is how buyers end up with blacklisted phones, activation-locked tablets, or devices that are nothing like the listing photos. Run through this checklist before any used device purchase: verify the seller, confirm the device is clean and unlocked, test condition and function, check what’s included, and pay through a method that protects you.
If you want most of that work done before you even see the listing, start on Swappa. Every listing is staff-reviewed against a strict set of criteria before it goes live.
