Do you have a iphone 4s. Kindly tell me that what is the difference in the functions of Iphone 3S and Iphone 4S. share your suggestions with me.

 

I could tell you the differences but effectively Apple have summarised it all here http://www.apple.com/iphone/compare-iphones/

The long and the short of it is, dual cameras, faster, better screen, has flash, better bluetooth, cant be jb'd just yet if on the latest iOS and costs more