Whilst the 4S and it's smaller brother, the iPhone 4, look the same from the outside, Apple have performed some major internal designs with this latest release.
The CPU has been upgraded to a dual core A5 CPU (the same as in the iPad 2) - resulting in a dramatic increase in performance. Graphics are up to 7X faster, and Safari renders in half the time.
The 4S features both GSM and CDMA mobile radio's - increasing the coverage and usability for networks worldwide. The optics have been upgraded, and now feature an 'all-new' 8 Megapixel camera, with a larger aperture for sharper photo's, and the ability to shoot video at 1080P, utilizing stabilization via the gyro sensor.
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Retail Price From Apple - Currently $679 (16GB Model Only)
Currently Apple is only selling the iPhone 4S in it's smallest capacity, 16GB. These iPhone's are unlocked and will work with any SIM card. You recieve the full 12 month warranty from Apple, with option to extend up to 3 years with Applecare.
iPhone 4S Plans - You can purchase the iPhone on a plan, and pay it off monthly, alongside normal plan charges. This is great option for anyone who would like a fixed budget each month, however you can end up paying more for the iPhone.
Cool Information : Whistleout Australia has a great tool to compare iPhone plans. Get the low down on the iPhone 4S - Wikipedia style.In-depth review on the iPhone 4S by Tech Radar. Find out how the iPhone 4S is constructed in this teardown by iFixIt!