iPhone 4 — Retina Display and FaceTime
Apple introduced the iPhone 4 with the Retina display and FaceTime video calling, setting a new standard for smartphone design.
On June 24, 2010, Apple released the iPhone 4, featuring a stainless steel and glass design that Steve Jobs called "the most precise thing we've ever made." Its centerpiece was the Retina display — a screen with 326 pixels per inch, dense enough that the human eye could not distinguish individual pixels at normal viewing distance. The iPhone 4 also introduced FaceTime video calling, the front-facing camera, and a gyroscope for improved motion sensing. Despite the "Antennagate" controversy (signal loss when held a certain way), the iPhone 4 sold over 1.7 million units in its first three days and established the design language that would define smartphones for years.
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