The iPhone 4S is the fifth iPhone that was created by Apple. It is very thin, and has a touchscreen.
It was first available for pre-order on October 7, and it went on sale on October 14 in the United States, Australia, Canada, the United Kingdom, France, Germany, and Japan. It was made available in more countries over the next few months.
The iPhone 4S had the same design as the iPhone 4, but has several new features such as an upgrade to the Apple A5 processor, and an 8 MP camera with 1080p video recording. It shipped with iOS 5, which is the fifth major version of Apple's mobile operating system, iOS. It had new features such as iCloud, iMessage, Notification Center, Reminders, and integration with Twitter. It also had a voice activation system named Siri that was included in later generations of mobile Apple products.