It debuted with iOS 5, the fifth major version of iOS, Apple's mobile operating system, that introduced features including iCloud, iMessage, Notification Center, Reminders, and Twitter integration. Reception to the was generally favorable. Reviewers noted Siri, the new camera, and processing speeds as significant advantages over the prior model. It was succeeded by the iPhone 5 as Apple's flagship phone on September 12, 2012. The iPhone 4S remained on sale, albeit being sold with reduced storage (from 16/32/64 GB down to 8 GB). The 4S was officially discontinued on September 9, 2014 following the announcement of the iPhone 6, although production did continue for developing markets until February 17, 2016. During the course of its lifetime, the iPhone 4S was one of the best-selling iPhones ever produced and it is the first iPhone to support five major versions of iOS: iOS 5, iOS 6, iOS 7, iOS 8, and iOS 9 (the iPad 2 was supported from iOS 4 to iOS 9). The 4S is also the last iPhone to have the original 30 pin connector as the succeeding iPhone 5 replaced it with the all digital Lightning Connector. As early as May 2011, some leaks had a fairly accurate description of the iPhone 4S including the name "", the Apple A5 chip, HSDPA, new camera, and Sprint carrying. The was unveiled at Apple's "Let's Talk iPhone" event on October 4, 2011, on the Apple Campus in Cupertino, California. The keynote was the first which Tim Cook gave since the Verizon keynote earlier in the year. It was also Cook's first launch without Apple co-founder Steve Jobs, whose health was deteriorating, and he died the day after the announcement of the . Tim Carmody of "Wired" praised Cook for focusing on company achievements, calling him a "global business thinker" and a "taskmaster". At the "Let's Talk iPhone" event held by Apple on October 4, 2011, Mike Capps demonstrated Epic Games' "Infinity Blade II", the sequel to "Infinity Blade", on an . Capps boasted that the game uses Epic Games' Unreal Engine 3 and features the same graphic techniques used in the Xbox 360 game "Gears of War 3". Speculation about Apple's next generation phone, including various specifications and a predicted name "iPhone 5", had been widespread in the time preceding its debut. After the was announced, it was considered by some media to be a disappointment, due to the expected release of an iPhone 5.