Need to know some specs about the iPhone 4S?

-Is updating IOS versions free? (6.0 to 6.1 example)
-How do i update?
-Is IOS 7 on 4S

There free you just go on your settingsand upload it just make sure you have enough phone storage

Read this
http://new-articles4u.blogspot.com/2013/06/ios-7-better-or-worst.html

-Yes
-Just plug into iTunes & it will guide you or check in the Settings for the software update
-It will be

If you want to try iOS 7 early, you'll have to register your device with a site like http://www.instantudid.com/ for $5. Then you can activate the beta.