How different is the iPhone 4 and iPhone 4S?

How different is the iPhone 4 and iPhone 4S?

4S has a slighty faster processor, and has siri, while 4 does not. Looks are 99% identical.

The main difference would be 'Siri'. But then again most people don't even use her so it's not worth getting the 4s over the 4.

The biggest difference is when you hold an iphone 4 a certain way, network drops completly (death grip) resolved on iphone 4s. Has a faster processor for smoother display and gameplay and higher screen resolution for a more sharp and vivid display, and they jumped up the camera to HD

The Bluetooth has been upgraded from 2.1 on the 4 to 4.0 on the 4s

You get a better camera 8MP on the 4s and 5MP on the 5

You get an A5 chip in the 4s which is faster than what is in the 4

A faster processor and finally
You get Siri your own personal assistant

IPhone 4S over 4
Siri
A5 chip
Panorama
"Death grip" fix
Price
Camera

The iPhone 4 and 4s look exactly the same. Both have a very fragile back (luckily that can be replaced) and horrible cell reception if you hold them a certain way. The only differences between the two is the chips inside (the 4s having a better one than the 4) and Siri (the 4s is the one with Siri, hence the 's' at the end). But if you were to jailbreak the 4, you could get Siri anyways so that doenst really matter.

So, to answer the question quickly, they are exactly the same except for the chips inside.

Differences:
-Improved antenna system; no longer dropping calls
-8 MP camera over the 5 MP of the iPhone 4
-Siri
-Faster processor
-Contains both a GSM and CDMA chip, rendering it a world phone (if you buy it unlocked)

That's really about it.