IPhone 4S

The iPhone 4S, retroactively re-stylized the iPhone 4s, is a touchscreen-based smartphone developed, manufactured, and released by Apple Inc. It is the fifth generation of the iPhone, succeeding the iPhone 4 and preceding the iPhone 5. Announced on October 4, 2011 at Apple's Cupertino campus, its media coverage was accompanied by the death of former Apple CEO Steve Jobs on the following day.

Available for pre-order on October 7 and coming to mainstream availability in retail stores on October 14 in the U|United States, Australia, Canada, the United Kingdom, France, Germany, and Japan, sales peaked over its predecessor with over a million sales in the first twenty-four hours of preorder availability and over four million sales in the first four days of retail availability. Further worldwide rollout, including 22 additional countries on October 28, came over the next several months.

Retaining the external design of the iPhone 4, the 4S hosted revised hardware specifications, most notably an upgrade to the Apple A5 chipset, and an eight-megapixel camera with 1080p video recording. It debuted with iOS 5, the fifth major version of Apple's mobile operating system, that introduced features including iCloud, iMessage, Notification Center, Reminders, and Twitter integration. It also debuted a 4S-exclusive intelligent personal assistant named Siri that was later included in future generations of mobile Apple products.

Reception to the iPhone 4S 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, however the 4S continues in production albeit being sold at a lower price point.

A lot of people had used iPhone 4S since 2011, but in Frankfurt and for the Singapore military, some of them uses a non-camera phone until it was fully dismantled in September 2012.