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
History of iPhone the phones on June 29, 2012. T-Mobile began offering iPhone on April 12, 2013. On November 9, 2007, the iPhone was officially launched As in the case of the previous launch in the US, customers lined up as much as a day in advance to obtain the much-anticipated phone. Apple occasionally produced a limited number of 4GB iPhones for German and UK markets, but they never reached end customers and were used as in-store demo units. Later most of the units were disposed of. The initial operating model of locking iPhone owners to one selected carrier has been controversial in