The Old Ways We Explained New Tech: The iPhone - 2007
It’s quite a device. It’s a hair taller and wider than a Treo but thinner, sleeker and of course much more beautiful (4.5 x 2.4 x 0.46). The front is glossy black; the back is brushed silver. There’s not much on the front but a 3.5-inch touch screen with incredibly high resolution—160 pixels per inch (320 by 480)—and not much on the brushed-silver back except a two-megapixel camera lens. (Only the Apple logo is mirror finish; it doubles as the self-portrait mirror.)
And a touch screen that lets you perform two-finger gestures—for example, you pinch your thumb and forefinger to shrink a photo, or widen them to enlarge it.