Which iPhone model introduced FaceTime video calling in 2010?

The iPhone 4 introduced FaceTime video calling in 2010. Apple unveiled the phone at its Worldwide Developers Conference on June 7, 2010, and released it on June 24 in several countries.

FaceTime depended on the iPhone 4’s new front-facing camera, which allowed users to make video calls while looking at the display. It launched as part of iOS 4 and initially worked over Wi-Fi between compatible Apple devices, including iPhones, iPod touches, iPads, and Macs.

The iPhone 4 was more than a software update: it introduced Apple’s Retina display, an A4 chip, and a glass-and-stainless-steel design. A common mix-up is the iPhone 4s, released in 2011; that model added Siri and improved performance, but it did not introduce FaceTime.