Buying a Used iPhone: Complete Safety Checklist
A used iPhone can be an excellent purchase — significantly cheaper than new, often in excellent condition, and capable of running the latest iOS for several more years. But the used iPhone market has genuine risks: misrepresented models, hidden iCloud locks, carrier locks, battery degradation, water damage that is invisible from the outside, and outright counterfeits. This comprehensive safety checklist covers every check you should perform before buying a used iPhone, organized by what you can verify remotely (before meeting), what to check when you have the device in hand, and what to test before handing over payment.
Pre-Meeting Checks: Verify Before You Go
Before traveling to meet a seller or committing to a purchase, you can verify several important facts using only the serial number or IMEI. Check 1 — Request the serial number or IMEI upfront: In your opening message to any used iPhone seller, ask for the serial number or IMEI. A legitimate seller has no reason to refuse this request. If they decline, claim not to know how to find it, or offer to 'check later', move on — there are plenty of legitimate sellers who will share it immediately. Check 2 — Run the iPhone Checker: Enter the serial number or IMEI in our tool. Verify: the model matches what is listed, the storage matches, the production year aligns with the described condition ('like new' for a 4-year-old phone is a yellow flag), the carrier lock status matches what the seller claims, and the warranty status is as described. Check 3 — Check IMEI blacklist status: Use our checker or a dedicated IMEI check service to verify the IMEI is not blacklisted as stolen or lost. A clean IMEI is necessary for the phone to work on cellular networks. Check 4 — Research the market price: Use platforms like Swappa's price index, eBay completed listings, or Back Market's pricing to understand the fair market value for the exact model, storage, and condition. A price significantly below market warrants additional scrutiny. Check 5 — Verify seller history: On eBay, check feedback score and read recent reviews. On Swappa, check the seller's ratings. For Facebook Marketplace, check how long the profile has been active, whether it has photos, and whether it looks like a real person's account. Newly created accounts with no purchase history selling expensive phones at below-market prices are a risk pattern. Check 6 — Review the listing photos carefully: Are the photos showing the actual device or stock photos? Ask for a photo showing the Settings > General > About screen with the serial number visible — this proves the listing photos are of the actual device. Any hesitation on this request is a red flag.
In-Person Physical Inspection Checklist
When you have the device in hand, work through this physical inspection checklist before testing any functionality. Check 7 — Screen inspection: Hold the screen at multiple angles under good light. Look for: scratches (common, usually only cosmetic), cracks (negotiation point or dealbreaker depending on severity), dead pixels (look for dark or bright dots that do not change), burn-in (faint ghost images visible on solid-color screens, more common on OLED displays used since iPhone X), and discoloration (yellowing, blotching, or an uneven glow around the edges). Check 8 — Body inspection: Check the aluminum or stainless steel frame for dents, deep scratches, or bends. Slight bends in older iPhones (especially 6 and 6 Plus models) indicate the device has been sat on or heavily loaded. Check the back glass for cracks — rear glass replacement is expensive on models where it requires adhesive removal. Check 9 — Button functionality: Press every physical button: volume up, volume down, side/power button, and mute switch (on models that have one). Each should give clear tactile feedback and a definitive click. Mushy or unresponsive buttons indicate wear or internal damage. Check 10 — Port inspection: Examine the Lightning or USB-C port with a light. Look for lint packed into the port (common, usually cleanable), bent pins, corrosion (green or white deposits suggesting moisture exposure), or physical damage. A damaged port affects charging and data transfer. Check 11 — Water damage indicators: Each iPhone has liquid contact indicators (LCIs) — small white stickers inside the device that turn red or pink on contact with water. The most accessible LCI location varies by model but is typically visible in the SIM card tray slot with a flashlight. A red or pink indicator means the device has been exposed to liquid. This does not necessarily mean it is damaged, but it means the warranty (if any remains) will not cover any subsequent issues, and liquid damage is often progressive. Check 12 — Face ID or Touch ID: For Face ID models, test by looking at the phone to unlock it. Try from multiple angles and with your face partially covered to test robustness. For Touch ID, register your own fingerprint temporarily and test with multiple fingers.
Software and Account Checks
Software checks are the most critical category — a phone with perfect physical condition is worthless if it is iCloud locked or has an undisclosed software issue. Check 13 — iCloud Activation Lock: In Settings, tap the name at the top of the screen (this shows the Apple ID). The seller's Apple ID should be signed in. Before purchasing, ask the seller to sign out of their Apple ID in front of you (Settings > [Name] > Sign Out). They will need their Apple ID password. If they cannot provide it, refuse the purchase. After sign-out, you should see 'Sign In to Your iPhone' at the top of Settings — this means the device is clean. Alternatively, ask them to erase the device (Settings > General > Transfer or Reset iPhone > Erase All Content) which requires their Apple ID to complete. Check 14 — iOS version: Go to Settings > General > Software Update. The device should be running a recent iOS version. A phone stuck on iOS 14 or 15 (when the current version is 18+) may indicate the device is blacklisted (carriers block updates on blacklisted devices) or that the device is too old to update further. Check 15 — Battery health: Settings > Battery > Battery Health and Charging. Above 85% is good. 80–85% is acceptable. Below 80% means the battery will need replacement, which costs $69 through Apple. Factor this into your offer if health is below 80%. Check 16 — Storage check: Settings > General > iPhone Storage. Verify the total storage matches what you paid for (128 GB, 256 GB, etc.). A phone advertised as 256 GB showing 128 GB of total storage has been misrepresented. Check 17 — Unknown parts check: On iPhone 12 and later running iOS 15.2+, go to Settings > General > About. Scroll to check for any 'Important Message' or 'Unknown Part' notifications for the battery, display, or camera. These indicate non-genuine or non-Apple-authorized components, which affect functionality and warranty coverage.
Final Functionality Tests Before Payment
These tests should be the last things you do before exchanging money. They confirm the core functions of the device work as expected. Check 18 — Cellular connectivity: Insert your own SIM card (bring one to the meetup) and verify the phone connects to your carrier's network. If the phone is carrier locked, your SIM will show 'SIM not supported' — confirm with the seller whether this is the case and whether it matches what was advertised. Check 19 — Camera test: Open the Camera app. Test the rear camera (take a photo and review it for focus, exposure, and any spots or smears from a damaged lens). If the model has multiple rear cameras (wide, ultrawide, telephoto), test each by switching between them. Test the front camera. Test video recording. On phones with LiDAR (iPhone 12 Pro and later), a malfunctioning LiDAR sensor shows up as poor Portrait mode depth estimation. Check 20 — Audio test: Make a phone call (use your SIM) and test the earpiece speaker and microphone. Play music or a video to test the bottom speakers. Test speakerphone. On older iPhones, the earpiece speaker also handles phone calls — a crackling or muffled earpiece needs attention. Final: Confirm the price and any accessories included (original cable, AirPods, case) and pay with a traceable method. Avoid cash if possible — credit card or PayPal Goods and Services provides dispute protection in case problems emerge after the transaction.
Frequently Asked Questions
- What is the biggest mistake people make when buying a used iPhone?
- Not checking Activation Lock before paying. Thousands of people buy iCloud-locked iPhones every day. The phone looks and feels completely real, may have been tested briefly and appeared to work, but when the buyer tries to set it up at home, they are greeted with 'Activation Lock — This iPhone is linked to an Apple ID'. The device is a brick without the previous owner's credentials. Always ask the seller to sign out of their Apple ID or perform a factory reset in front of you before you pay.
- Is it safe to buy an iPhone with a cracked screen?
- It depends on the damage. Small, peripheral cracks that do not affect the display function are mainly cosmetic and can be a source of significant discount. Large cracks, cracks over the Face ID area, cracks with bleeding pixels or dead zones, or cracks severe enough to present cut hazards are more serious. Screen replacement at Apple costs $229–$329 for recent models depending on the model. If the crack is significant, get a quote for screen replacement, deduct it from your target price, and ensure the hardware still functions correctly before buying.
- Should I buy a used iPhone from a stranger on Facebook Marketplace?
- Only if you follow the full verification checklist and meet in a safe public location. Facebook Marketplace has no built-in buyer protection for in-person cash sales. Run the iPhone Checker on the serial number before meeting. Meet in a public place during daylight hours — many police departments offer their parking lots as designated safe transaction zones. Bring your own SIM card to test cellular. Insist on watching the seller sign out of their Apple ID. Pay by bank transfer or PayPal Goods and Services rather than cash if possible, as these create a record and may offer dispute resolution.