A two-year-old flagship for $350. That’s the promise of the used phone market — and it’s real. A used iPhone 13 or Galaxy S22 will outperform a brand-new $350 budget phone in almost every way. But the used market also has its share of lemons: phones with dying batteries, blacklisted IMEIs, and sellers who vanish the moment you drive away.
Here’s how to tell whether a used phone is actually worth buying, whether you’re scrolling Facebook Marketplace, browsing eBay, or meeting someone in a parking lot.
The Five Checks That Matter Most
1. Is It Blacklisted or Still on a Payment Plan?
This is the dealbreaker check, and you do it before meeting anyone. Ask the seller for the IMEI number (dial *#06# on the phone to display it). Then run it through a free checker:
- CTIA Stolen Phone Checker (stolenphonechecker.org) — the US industry database
- Your carrier’s own BYOD checker (Verizon, AT&T, and T-Mobile all have them)
A blacklisted phone — reported stolen or tied to an unpaid carrier balance — won’t activate on any major US network. It’s a brick with a nice screen. If the seller won’t share the IMEI, walk away. No exceptions, no “I’ll show you in person.” Legitimate sellers share it without blinking.
2. Battery Health
On iPhone: Settings → Battery → Battery Health & Charging. You want 85% or higher; below 80% means budget $50–$90 for a replacement. On Android, check Settings → Battery for health info (newer Pixels and Samsungs show it), or ask the seller to install AccuBattery and show you the estimated capacity.
A phone with 78% battery health isn’t necessarily a bad buy — it just shouldn’t be priced like one with 92%.
3. Is It iCloud / Google Locked?
Ask the seller to factory reset the phone in front of you and go through setup without entering their account. If it asks for the previous owner’s Apple ID or Google account, it’s activation-locked — meaning it’s either stolen or the seller forgot to remove it, and either way you can’t use it. This is the most common way Marketplace buyers get burned.
4. Physical Inspection (2 Minutes)
- Check the screen for dead pixels and touch dead zones (drag an app icon slowly across the whole screen — if it drops, there’s a dead zone).
- Test all cameras, front and back, including flash.
- Plug in a charger — does it charge? Wiggle gently — a loose port is a repair waiting to happen.
- Make a test call on speakerphone to check the earpiece, mic, and speakers.
- Check for water damage: iPhones have a liquid contact indicator in the SIM tray (red = water exposure).
- Look at the screws on the bottom — stripped or mismatched screws mean it’s been opened, possibly badly.
5. Software Support Remaining
A used phone is only a good deal if it’ll keep getting security updates. Check the manufacturer’s support timeline: iPhones get 6–7 years from release, Pixels now get 7, recent Samsungs 4–5. A 5-year-old iPhone at a “great price” with one year of updates left is worse value than a 3-year-old one with three years left. Our guide on how long a smartphone should last has the full breakdown by brand.
Where to Buy (Ranked by Safety)
- Manufacturer refurbished stores (Apple Refurbished, Samsung Re-Newed) — highest prices, but inspected, genuine parts, real warranties. The safest used phones you can buy.
- Back Market / Amazon Renewed — standardized grading, warranties, return windows. My recommended sweet spot for most buyers.
- Carrier stores — certified pre-owned programs with warranties.
- eBay (top-rated sellers) — good buyer protection, but check the seller’s history carefully.
- Facebook Marketplace / Craigslist — best prices, highest risk. Meet in a public place (many police stations offer safe trade zones), run every check above, and pay only after the phone passes.
For the full playbook on buying refurbished safely, see what to look for when buying refurbished tech online — the principles are the same even though that guide focuses on laptops.
What’s a Fair Price?
Check three sources before making an offer: Swappa’s listings (the enthusiast marketplace with the most accurate pricing), eBay’s sold listings (not asking prices — filter by “Sold items”), and the trade-in values from Apple/Samsung (your floor — a private seller should beat trade-in value but not by much).
General rule: a used flagship in good condition should cost 40–60% of its original price at the 2-year mark. If someone’s asking 80% of new for a 2-year-old phone, just buy new — you’ll get a full warranty and a fresh battery.
Red Flags That Mean “Walk Away”
- Seller won’t share the IMEI beforehand
- Price far below market (stolen, blacklisted, or bait)
- “Just needs a simple fix” — if it were simple, they’d have fixed it
- Won’t factory reset in front of you
- No original box, no receipt, vague story about where it came from
- Pressure to pay with gift cards, wire transfer, or crypto
The FTC’s guidance on online marketplace scams is worth a read before any in-person purchase — the patterns are remarkably consistent.
Frequently Asked Questions
Is it safe to buy a used phone from a stranger on Marketplace?
It can be — thousands of people do it daily without issues — but the safety is in the verification, not the platform. Always meet in a public place (many police stations have designated safe-trade zones), run the IMEI check before meeting, and complete every inspection step before handing over money. Never pay in advance, never pay with gift cards or wire transfers, and trust your gut: if the deal feels off, walk away. There’s always another listing.
How much should I pay for a used phone?
Check Swappa listings and eBay’s sold listings (not asking prices) for your exact model and condition. As a rule of thumb, a 2-year-old flagship in good condition goes for 40–60% of its original retail price. Adjust down for low battery health, cosmetic damage, or missing accessories; adjust up for mint condition with box and extras. If the asking price is close to new, buy new — the warranty and fresh battery are worth the difference.
Should I buy a used phone or a refurbished one?
Refurbished (from a reputable seller) is safer: inspected, graded, warrantied, with a return window. Used (private seller) is cheaper: no middleman markup. If you’re comfortable running the five checks in this guide and the price difference is significant ($100+), buy used. If you want peace of mind and a warranty, pay the refurbished premium. There’s no wrong answer — just match the choice to your risk tolerance and technical confidence.
What should I do immediately after buying a used phone?
Factory reset it yourself (even if the seller claims they did), update to the latest OS, run a battery health check to confirm what you were told, and change all the passwords on accounts you set up. Then put a case and screen protector on it before it leaves the house — protecting your “new” phone from day one is how you keep the deal a deal.
The Bottom Line
A used phone is worth buying when: the IMEI is clean, the battery health is 85%+, it’s not activation-locked, it has years of software updates left, and the price reflects its real condition. Run those five checks every time and you’ll get flagship performance at half price — skip them and you’re gambling. The ten minutes of verification is what separates a great deal from an expensive lesson.
