Buying a Phone on Facebook Marketplace? Run These 5 Checks First
Facebook Marketplace, OfferUp, and Craigslist are the most popular places to buy used phones — and also where most phone scams happen. In 2025, the FTC reported that electronics were the #1 category for marketplace fraud, with used phones leading the list.
The good news? Five quick checks before handing over your money can protect you from buying a stolen, blacklisted, or broken phone. Here's exactly what to do.
Check #1: Verify the IMEI Number
The IMEI is a phone's unique fingerprint. Before meeting the seller, ask them to send you the IMEI number (15 digits from dialing *#06#).
Then run a free IMEI check on Verimei to verify:
- Is it blacklisted? A blacklisted phone was reported lost/stolen and won't work on any carrier
- Is it carrier-locked? A locked phone only works on one carrier — make sure it's compatible with yours
- Model verification: Confirm the IMEI matches the model they're advertising (prevent bait-and-switch)
- Warranty status: A phone still under warranty is worth more
Red flag: If the seller refuses to share the IMEI before meeting, walk away. Legitimate sellers have nothing to hide.
What to Do When You Meet in Person
Verify the IMEI matches what they sent you:
- Dial
*#06#on the phone in front of you - Compare with the IMEI the seller sent earlier
- Compare with the IMEI on the SIM tray and box (if available)
- If any don't match, the phone may have a replaced motherboard or stolen parts
Check #2: Test for iCloud Lock / Google Lock
An activation-locked phone is a paperweight. Even after you pay, you won't be able to use it.
iPhone
- Ask the seller to go to Settings → [Name] → Find My → Find My iPhone
- It should say OFF
- If it says ON, ask them to turn it off by entering their Apple ID password
- Better yet: run a free iCloud check using the IMEI before meeting
Android
- Factory-reset the phone in front of you
- If it asks for a Google account during setup (Factory Reset Protection), it's locked
- The seller must sign out of their Google account in Settings before resetting
Check #3: Inspect for Physical Damage & Repairs
Used phone sellers sometimes hide damage with cases or screen protectors. Here's what to inspect:
- Screen: Remove the screen protector. Look for scratches, dead pixels, touch dead zones (test all four corners), or a faint green/purple tint (OLED burn-in)
- Frame: Check all edges and corners for deep dents or bends
- Water damage: Check the SIM tray slot — the water indicator is visible. White = good, pink/red = water damage
- Camera: Take photos in bright light and low light. Check both front and rear cameras
- Speakers: Play music at max volume. Crackling or distortion means speaker damage
- Buttons: Test the power button, volume rocker, and mute switch (iPhone)
- Charging port: Plug in a cable — it should charge immediately with no wiggling required
Check #4: Verify Battery Health
Battery degradation is the most common issue with used phones. A phone with 75% battery health will die by mid-afternoon with normal use.
iPhone
Settings → Battery → Battery Health & Charging → Maximum Capacity
- 90-100%: Excellent — like new
- 80-89%: Good — noticeable on heavy days
- Below 80%: Needs replacement soon ($89-$119 at Apple)
Samsung
Open Samsung Members app → Support → Phone diagnostics → Battery status
Price Adjustment Guide
| Battery Health | Price Impact |
|---|---|
| 95-100% | Full asking price is fair |
| 85-94% | Negotiate $30-50 off |
| 80-84% | Negotiate $70-100 off (battery replacement needed) |
| Below 80% | Major discount — factor in $89-119 replacement cost |
Check #5: Test Carrier Compatibility
Not every phone works on every carrier. Before meeting:
- Ask if the phone is unlocked — unlocked phones work on any carrier
- Check carrier compatibility — use your carrier's website or run a SIM lock check on the IMEI
- Test with your SIM: Bring your SIM card and insert it during the meetup. Make a call and test mobile data to confirm it works
Common pitfall: Some phones from prepaid carriers (Straight Talk, Cricket, Metro) have activation locks that require 6-12 months of service before unlocking. Always verify unlock status.
Meeting Safety Tips
- Meet in public: Police stations, bank lobbies, or busy coffee shops
- Bring someone: Don't go alone, especially for high-value purchases
- Daylight hours: Always meet during the day
- Use secure payment: PayPal Goods & Services offers buyer protection. Avoid Zelle, Venmo, Cash App, or cash for expensive items
- Get a receipt: A simple handwritten note with both names, the phone model, IMEI, amount paid, and the date
Red Flags to Walk Away From
| Red Flag | What It Usually Means |
|---|---|
| Price is too good to be true | Stolen, blacklisted, or defective device |
| Seller won't share IMEI | Phone may be stolen or blacklisted |
| Phone is in a sealed box (no inspection) | Could be empty box or wrong phone |
| Seller pressures you to decide quickly | Classic scam tactic |
| Find My / activation lock is on | You'll own a paperweight |
| IMEI on box ≠ IMEI in settings | Replaced parts or reboxed stolen phone |
| Seller only accepts cash payment | No paper trail for disputes |
Final Checklist
Before paying, confirm all five:
- ✅ IMEI is clean (not blacklisted, matches the model)
- ✅ No iCloud / Google activation lock
- ✅ Physical condition verified (screen, water indicator, buttons)
- ✅ Battery health acceptable (80%+ for iPhone, good status for Samsung)
- ✅ Works on your carrier (tested with your SIM)
Running all five checks takes about 10 minutes during the meetup and can save you hundreds of dollars. Start with a free IMEI check on Verimei before you even leave the house — if the IMEI comes back dirty, you've saved yourself a trip.
