Obtain the 15-digit IMEI number by dialing *#06# or checking Settings > General > About . Use a free online tool like the CTIA Stolen Phone Checker to ensure it hasn't been reported lost or stolen. 2. Hardware and Parts Authenticity
Apple's modern software can help you identify if a phone has been repaired with low-quality components. If you want to buy a preowned iPhone - Apple Support
Go to Settings > General > About . Look for Carrier Lock (or Network Provider Lock); it should ideally say "No SIM restrictions". If it shows a specific carrier, it will only work with that network unless officially unlocked.
Buying a used iPhone can save you hundreds of dollars, but it requires a careful verification process to avoid getting stuck with a "bricked" or faulty device. As of early 2026, the market is filled with various models, and following a standardized checklist is essential for a safe purchase.
Before any money changes hands, you must verify the phone's legal and security status.