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Begin by inspecting the IMEI or serial number, pivotal for unveiling the iPhone's history, like reports of loss or theft. Verify via Apple's site or IMEI checkers online.
Make sure the iPhone isn't locked with Activation Lock, needing the owner's Apple ID and password. Check this on the iCloud Activation Lock status site.
Thoroughly examine the iPhone for damage like scratches, dents, or cracks. Test the screen, buttons, and ports to ensure they function properly.
Check the iPhone's battery health to see how long it holds a charge. Look in settings under "Battery" or use third-party apps. A worn battery might need replacing, costing extra.
Since iPhones aren't waterproof, it's crucial to watch for water damage signs like spots, corrosion in the charging port, or activated liquid indicators.
Fully test all iPhone features: camera, speakers, microphone, Touch ID/Face ID, and connectivity (Wi-Fi, Bluetooth, cellular). Make calls, send texts, and download apps to confirm functionality.
Verify the iPhone's warranty and support coverage to see if it's still eligible for Apple's warranty or AppleCare+ service. Enter the device's serial number on Apple's website.