iOS actually began life with a different name: OS X. During the original iPhone announcement, Apple touted that it ran on the same Unix core as Mac OS X and that it used many of the same tools.

iOS 5.0 — Siri, wireless sync, and iCloud Apple. The iOS 5.0 platform and the iPhone 4S were important releases for Apple, with Android making serious gains in the smartphone market. There was ...

However, iOS 16 will also mark the first time since iPhone OS 1.0 that not a single iPod device is on the list. The first iPod Touch came out in September 2007 with iPhone OS 1.1.