iPhone 5s

The 5s looked almost exactly like the iPhone 5 and changed more underneath than any iPhone since the 4. Touch ID arrived first: a sapphire-covered capacitive fingerprint reader built into the home button, which replaced the passcode for most people and later became the thing that made Apple Pay work. The A7 was the bigger deal. It was the first 64-bit chip in any phone, two years ahead of the Android market, and it forced the entire industry onto 64-bit ARM faster than anyone had planned. Qualcomm's marketing chief called it a gimmick and was moved off the role shortly afterward. Alongside it sat the M7 motion coprocessor, which tracked the accelerometer and gyroscope at low power so fitness apps could run all day without draining the battery. The camera kept 8 megapixels and got larger pixels, a wider f/2.2 aperture and a dual-LED True Tone flash that stopped indoor photos coming out orange. Slow-motion video at 120 frames per second turned up here too. Apple sold it alongside the 5c from September 20, 2013 and kept it on the price list until 2016.