Guides for testing and selling used iPhones.
Practical, no-fluff guides for refurbishers, resellers, repair shops, and wholesalers who want better device inspection standards — and proof buyers can verify.
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Every guide is grouped by what it helps you do — inspect, grade, certify, or sell. Start anywhere.
Comparison
How a certified-check approach compares with traditional diagnostic tools.
Device testing
What a thorough inspection covers and how to test a device on-device, not by estimate.
How to Test a Used iPhone Before Reselling
A practical, step-by-step walkthrough for testing a used iPhone before you list it — from display and cameras to battery and activation lock.
Read guideThe Used iPhone Inspection Checklist
The full inspection checklist for a used iPhone — every display, camera, audio, sensor, button, connectivity, and battery point to verify.
Read guidePhone Diagnostic Software: A Practical Guide
How phone diagnostic software works for used iPhones — on-device measurement vs estimates, what it tests, and what makes results trustworthy.
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Grading
Turn subjective condition calls into grades you can defend across every bench.
The Refurbished iPhone Grading Guide
What refurbished iPhone grades mean, how cosmetic and functional grading differ, and how to make grades consistent and defensible across a bench.
Read guideGrade A Needs a Better Standard
Grade A is inconsistent across sellers. A clearer, function-first standard for grading used iPhones — and proving the grade to buyers.
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Certification
What a tamper-evident certificate proves and how buyers verify it.
The iPhone Test Certificate Guide
What an iPhone test certificate proves, the device facts it shows, and how buyers verify a tamper-evident certificate with no login.
Read guideWhat Buyers Want When Buying a Used iPhone
The signals used iPhone buyers look for — honest condition, working hardware, a clean activation status, and proof they can verify themselves.
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Activation lock
Confirm Find My and activation-lock status, and verify a clean wipe before resale.
Activation Lock Checks for Resellers
How to check activation lock and Find My status before reselling an iPhone — and how to avoid shipping a device a buyer can’t activate.
Read guideFind My, Wipes, and Resale Risk
Why an active Find My or an unverified wipe is a resale risk — how to confirm a clean erase and prove activation-lock status to buyers.
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Resale operations
Practical workflows for testing, certifying, and managing checks across a team.
Bulk iPhone Testing for Volume Sellers
A repeatable workflow for testing iPhones in bulk — consistent inspections, shared team credits, and a certificate for every device in a lot.
Read guideHow Repair Shops Certify Before Resale
How repair shops verify a device before and after a repair, certify the result, and give buyers verifiable proof that every function passed.
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Certify your next phone with confidence
Subscribe your shop in minutes. Run the 50-point inspection, issue verifiable certificates, and grade every device the same way — every time.