i OS 7, the system currently powering Apple's mobile devices, offers an easy-to-understand smartphone operating system to new users, a powerful platform for app developers, and a relatively un-fragmented experience across multiple devices.
Perhaps the most remarkable thing about i OS is how similar the OS as it exists today is to the OS as it existed 2007, yet the number and breadth of features that Apple has baked in since then is mind boggling.
Yes, it famously has never supported the Flash plugin, but it was the first mobile web browser that felt nearly as capable and powerful as a full desktop browser.
Where other mobile operating systems reflowed, reformatted, or simply broke the look and feel of web pages, mobile Safari presented the web fully and offered simple zoom and scrolling features that were unmatched at the time. Apple used its already-massive i Tunes and i Pod ecosystem to provide an "anchor" for the OS and the beginnings of what would eventually become a huge ecosystem of music, movies, television, books, and apps.
That certainly doesn't mean it's underpowered or underfeatured — quite the contrary.