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 7 on the iPhone 7 Plus model to provide enhanced zoom capabilities. Reception of the iPhone 7 was mixed. Although reviewers noted the improvements to the camera, especially the dual rear camera on the Plus model, they also stated that the iPhone 7 did not make significant changes to the display or build quality, where competing flagship smartphones surpassed the quality of the iPhone 7. Many reviews highlighted the controversial removal of the 3.5 mm headphone jack; some critics argued that the change was meant to bolster licensing of the proprietary Lightning connector and the sales of Apple's own wireless headphone