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The new 8-megapixel camera may look the same as the old one to the naked eye, but it takes far better photos - and videos
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Siri can handle punctuation with ease: simply include it in your speech and it will be transcribed into properly formed sentences.
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The camera on the 4S may not be up to the standards of a dedicated compact camera, but it's close. Plus, you'll always have it with you
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Photos from the iPhone 4 are decent enough, but they pale in comparison with those from the 4S
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Siri is your talking personal assistant and can use the built-in apps to check the weather, write text messages and emails, create reminders and perform web searches
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