The iPhone 4S had the same design as the iPhone 4, but has several new features such as an upgrade to theApple A5 processor, and an 8 MP camera with1080p video recording. It shipped with iOS 5, which is the fifth major version of Apple'smobile operating system,iOS. It had new features such asiCloud,iMessage, Notification Center, Reminders, and integration withTwitter. It also had a voice activation system namedSiri that was included in later generations of mobile Apple products.[5]
The iPhone 4S introduced a new automated voice control system called "Siri". It first operated only on the iPhone 4S.[6] It allows the user to give commands to the iPhone, which Siri can execute and respond to. For example, iPhone commands such as "What is the weather going to be like?" will generate a response such as "The weather is to be cloudy and rainy and drop to 54 degrees today". These commands can vary greatly and control almost every section of the phone. The commands given do not have to be specific and can be used withnatural language. Siri makes it is much easier and/or possible for people to use device functions while driving, exercising, or when they have their hands full.[7] It also means people with trouble reading, seeing, or typing can access the phone more easily.[7]
↑"iPhone 4S Teardown".iFixit. 2011-10-13. Retrieved2013-12-24.Check out the marking, specifically E4E4, denoting two 2 Gb LPDDR2 die—for a total of 4 Gb—or 512 MB