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i would say its faster. software improvements and hardware improvements help the phone, even with wifi based tasks. iOS 6 beta is faster on my iPhone 4s than what it was on iOS 5.
 
The wifi itself won't be faster, but since the phone itself is faster, yes it will browse faster. I used both my friends 4 and my 4S side by side. 4S is snappier for obvious reasons.
 
Rumor has it that the iPhone 5 will finally get 5.0 GHz WiFi-N. This will be a welcomed improvement!
 
Rumor has it that the iPhone 5 will finally get 5.0 GHz WiFi-N. This will be a welcomed improvement!

I you have basically just made that rumour up right now, I have read nothing on MacRumors or any other apple website saying it will (or even might) have 5GHz.
 
It's not necessarily faster, but you get a better signal due to better antennas.

A friend of mine had the 4 and he could only pick 3 AP's where we were, yet I picked up about 7.
 
The answer is yes in the sense that the 4s's CPU can process the downloaded data faster. There is a noticeable difference. The bottleneck is not the wifi chip on the phone, it is the CPU and GPU. The 4G on the 4S can actually be pretty darn fast. I have seen as high as 8mb down. That is great for non LTE.
 
don't think its faster (I believe both the 4 and 4S support both 2.4 & 5GHz standards of 802.11n) but other factors of the phone such as the java engine and processor speed my result in data being displayed quicker on the phone, therefore giving the impression of a faster wireless chip in the phone.
 
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