It's just an added ability that Apple decided was nessecary for the iPhone 4S, there is no real reason behind it.
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Apple needed something distinguishing that has potential sell 4s from 4 and android so people would buy it.
they have made an iPhone 4S it comes in black or white and the "s" stands for siri an intelligent assistant only in the iPhone 4S.
If you mean IPhone 4S the difference is that 4S has Siri, which is like a voice assistant on your phone.
Siri
The name of the pocket PC which was unveiled in year 2000 was iPAQ. This pocket PC served as a virtual assistant kind of like Siri for the iPhone 4s and iPhone 5.
The iPhone 4s is the 5th iPhone that Apple has made.
iphone 4s
No. iPhone 5 is not better than the iPhone 4S.
In AmericaiPhone 3GS (8gb) - FREE (with contract for AT&T)iPhone 4 (8gb) - $99iPhone 4S (16gb) - $199iPhone 4S (32gb) - $299iPhone 4S (64gb) - $399Unlocked iPhone 4S (16gb) - $649Unlocked iPhone 4S (32gb) - $749Unlocked iPhone 4S (64gb) - $849
iPhone 4s is easier to use, but it depends on which Htc, I would say the iPhone 4s
Soon after the iPhone 4 was released in June 2010, Apple fans began wondering about the iPhone 5. In October 2011 Apple announced and released the next version of the popular smartphone, the iPhone 4S. The main difference between the iPhone 4 and 4S is the addition of Siri, a voice-activated personal assistant. The 4S also boasts a Dual-core A5 chip, as opposed to the iPhone 4's A4 chip. The camera on the 4S has 8 megapixels compared to the 5 megapixel camera in the iPhone 4.
not a 4s but he has a red iphone 4
the iphone 4s stands for 4 speed