Some users also get new settings in the Notifications screen--at the bottom, grouped under Government Alerts--for enabling or disabling AMBER Alerts and Emergency Alerts. In our testing in the San Francisco Bay Area, Sprint and Verizon users see these settings, while AT&T users do not. However, the availability of these settings also appear to depend on your location: Responses to an informal poll of Twitter users indicate that Verizon users in some parts of the country get the settings, but those in other locations do not.

Location Services has been moved inside a new Privacy screen that lets you fine-tune access to Contacts, Calendars, Reminders, Photos, Bluetooth Sharing, and your Twitter and Facebook accounts. For each type of data, you can choose which apps have access to that data. The Location Services section of Privacy also gains a couple new settings, found in its System Services screen: toggles for Genius For Apps and Wi-Fi Networking.

In the Sounds screen on the iPhone, the two Vibrate toggles, previous split between a Silent section and the Ringer and Alerts section, are now grouped together as Vibrate On Ring and Vibrate On Silent. You can also now choose an alert tone for new-Facebook-post notifications, and you can choose one of seven preset vibration patterns, or create a custom vibration pattern, for each type of notification; these vibration patterns are in addition to each alert's audible tone. (You can also create and assign vibration patterns for individual contacts, but that's done in the Contacts app.)

On the iPad, the Sounds item is now at the top level of the Settings app--it was previously buried in the General screen.

On the iPhone and iPod touch, the previously separate Brightness and Wallpaper items have been combined into a single Brightness & Wallpaper item that includes the same options for each as before. (Brightness & Wallpaper was already a single item on the iPad in iOS 5.)