Thanks to iOS 5, iPhone 4S marks the first generation of iOS devices capable of being fully setup and activated without ever plugging into iTunes. Here's what the process looks like.
Sprint iPhone 4S review: Sprint iPhone 4S - CNET
If you downloaded iOS 9 on an iPhone 4s, you may be entitled to a refund check
My nostalgia: iphone 4 on ios 5, iphone 4s on ios 6 and an ipad 1 on ios 5 : r/iphone
First look: Setting up the new iPhone 4S with iOS 5
Apple iPhone 4S review: Apple iPhone 4S - CNET
How to convert an iPhone 3GS running iOS 5 into an iPod Touch for a child
Apple Reaches Settlement to Pay $15 to Some iPhone 4S Owners Who Experienced Buggy Performance After iOS 9 Update - MacRumors
Will iOS 9 slow down my iPhone 4s or iPhone 5/5s? Perhaps a little (Video) - 9to5Mac
First look: Setting up the new iPhone 4S with iOS 5