IPhone 4S announced iPhone 5s and iPhone 5c. This was unusual for Apple as an upper case 'S' had been used since the introduction of the iPhone 3GS in 2009. On September 9, 2014, the iPhone 4S was officially discontinued following the reveal of the iPhone 6 and the iPhone 6 Plus. However, 4S production did continue for developing markets until February 17, 2016. On June 13, 2016, following the release of iOS 10, Apple dropped support on the iPhone 4S, making iOS 9.3.5 the last version available for the device. The runs iOS, Apple's mobile operating system. The user interface of
IPhone X its Plus variant, and the iPhone SE, the iPhone X was discontinued on September 12, 2018 following the announcement of the new iPhone XS, iPhone XS Max and iPhone XR devices. As a result, with a shelf life of just over 10 months, the iPhone X had the shortest ever tenure as the flagship device in the history of the iPhone. On November 22, 2018, Apple has reportedly resumed production of the iPhone X due to weak sales of it successors. The iPhone X will not be available to buy on the Apple website and remains discontinued. The technology behind