Both my iPhone and iPad are now installing iOS 6, the latest version of Apple's operating system for its mobile phones and tablets.
iOS 6 was just made available today at 1:00 PM Eastern Time. You can force your iPhone or iPad to begin installing it immediately by opening the Settings app, then choosing "General", then "Software Update".
If you are still using iOS version 4 or lower, you need to use iTunes to install the latest version. However, anyone using iOS 5 or greater can install iOS 6 using the method I described above. (No need for iTunes.)
Leave yourself plenty of time: My updates have been going for about 25 minutes now, and they are still in the "Preparing Update" mode.