"Hi, I am very interested in buying your iPhone 14. Before I drive out to meet you, would you mind taking a screenshot of the 'About' screen in Settings (blurring your Apple ID email) and sending me the serial number? I just want to verify the warranty status and ensure it isn't activation locked. Thanks!"
Reveals the original hardware specs to ensure a seller hasn't swapped out internal parts. iPhone/iPad : Settings > General > About. Mac : Apple Menu () > About This Mac. search apple products by serial number
This tool only tells you about support eligibility and model identity. It does not tell you if Find My iPhone is activated. "Hi, I am very interested in buying your iPhone 14