Seller will lie. There's a chance that an original-parts iPhone is close to dying somehow, but it's not very high. Btw, you're comparing to the used car market

Seller will lie. There's a chance that an original-parts iPhone is close to dying somehow, but it's not very high. Btw, you're comparing to the used car market, and that's not a great one. It's hard or expensive to judge the actual condition of what you're buying. Most common metric is the odometer reading, and even that can be illegally tampered with.