Feature I'm most excited about

[mantan]

Is a proximity sensor that works!!!!

It'll be such a treat to be able to hold the phone on my shoulder when I need to use both hands without either muting the call, placing someone on hold or activating FaceTime!

I missed those features from the 3 and 3GS.....

 

[Applejuiced]

On the 4S it works fine.
On the iphone 4 they did have many problems.

 

[Want300]

On the 4S it works fine.
On the iphone 4 they did have many problems.

Yea... I remember that on the iPhone 4.

 

[mnsportsgeek]

LTE is the biggest feature i'm looking forward too by far. But that is boring to say, so I'll say the improved camera over my 4.