iPhone OS 1 (iOS 1) – 2007
Debuting in 2007, Apple created the first smartphone with a fully-featured web browser, email, texting, and a small productivity software suite.

iPhone OS 1, the first version of iOS, is one of the most significant achievements in computing history. The notion of using a touchscreen, an onscreen keyboard, and essentially enjoying a computer-like experience on a handheld device was unique to the first iPhone.

The first version of iOS didn’t feature the App Store. Instead, Steve Jobs envisioned a third-party ecosystem of web apps for the iPhone’s content.

iPhone OS 2 (iOS 2) – 2008
iPhone OS 2 launched alongside the iPhone 3G, which was the successor to the original iPhone. The “3G” description refers to the device’s support for 3G networks, which were relatively new at the time.

The App Store is the most critical feature of the iPhone OS 2. Apple’s second-generation mobile operating system also added support for Microsoft ActiveSync, allowing corporate users enhanced connectivity with popular desktop apps. Other features, such as enhancements to Mail, Maps, Calculator, and Contacts, rounded out a hefty release.

iPhone OS 3 (iOS 3) – 2009
iPhone OS 3 is the final version bearing this awkward moniker. Users finally gained the ability to cut, copy and paste text virtually anywhere on the iPhone. This version also debuted Spotlight, a powerful search tool once only available on the Mac. Apple also allowed users to send MMS multimedia attachments and a convenient Voice Memos app to its mobile operating system.

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