For iPhone 6, 6S, and 7 models, you’ll pay $200 to $400. Some of these phones are still available new. The iPhone 8 costs $400 to $600. Newer iPhones, such as the X, XS, and XR, have a $600 to $1,500 price tag. As a general rule, iPhones with more memory cost more than those with less memory within the same model line.