Siri
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Siri is one of apple's most impressive creations. Siri lets you use you voice to manage you iPhone. You can ask Siri to do things just by talking that way you talk. Siri understands you and even talks back.
Dual-core A5 chip.
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The iPhone 4S comes with two cores in the A5 chip, which delivers up to two times more power and up to seven times faster graphics. You will feel the difference when you're launching apps, browsing the web, gaming, and doing just about everything. The A5 chip gives the iPhone a long lasting battery.
8MP Camera
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The new and improved camera that comes with the iPhone 4S might just be the best camera ever on a phone. The camera has all-new optics and now has an 8-megapixel resolution and a custom lens with a larger f/2.4 aperture. It has an improved backside illumination sensor, excellent auto white balance, advanced colour accuracy, face detection and reduced motion and blur.
iOS 5
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The iOS 5 is the most advanced software that apple has ever designed. With the iOS 5 everything becomes easier, that's what makes iOS 5 years ahead of everything else. iOS 5 brings over 200 new features to the iPhone 4S.
iCloud
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The iPhone 4S comes with iCloud, which makes it much easier to manage all your stuff, because it manages it all for you. iCloud has your music, photos, apps, mail, contacts, calendars, documents, and more. iCloud wirelessly sends them to all your devices. It is done automatically, effortlessly, and seamlessly.