With every new version of iOS, Apple loves to add, tweak, and change settings; unsurprisingly, iOS 8 is no different. Here's a comprehensive list of just about everything the company has changed in iOS 8 within the Settings app.
The Cellular section used to be hidden in iOS's General section in previous versions, but was moved to the main screen of the Settings app in iOS 7. It remains there in iOS 8, and for the most part remains unchanged — Cellular features toggles for Cellular Data, LTE, and Data Roaming, along with the menu for using your iPhone as a Personal Hotspot (which, oddly enough, also gets its own listing on the main screen).
If you have a sharp eye, you'll notice that the layout of these toggles has changed ever so slightly: Cellular Data and Enable LTE are now stacked directly on top of each other with a shared caption about usage. They used to each have their own caption.
Scrolling down, you'll find info on your Call Time, broken down by Current Period and the total Lifetime of your iPhone. Your iPhone doesn't automatically start these new data periods — if you'd like to track a specific time period, scroll all the way down and tap Reset Statistics to start the count from zero. This won't affect the Lifetime count. Keep an eye on this section to avoid going over your monthly allotment of cellular call minutes (if your plan has restrictions, of course).
You'll also find info on your overall and roaming cellular-data usage, combining uploads and downloads into one usage stat. This is split into Current Period (which is again tied to the time period you set with Reset Statistics) and Current Period Roaming. Roaming usage is super handy for travelers with a data limit, as it lets you easily keep an eye on how much data you're using and scale back if necessary.
See that long list of apps in the next section? Those are all of the apps on your iPhone that use cellular data — all apps use cellular by default, but you can tap the toggle next to an apps' name to restrict it to Wi-Fi downloading. This will help tremendously if you're trying to watch your data usage.
Finally, at the very bottom of the screen, you'll see a listing for System Services; tap it to see all of the services that use data, and how much data each is using. Uninstalled Apps shows how much data any apps you've recently uninstalled used during the current period before you gave them the axe.
This section controls how your iPhone will receive notifications from other apps, and how they'll appear in your personal Notification Center — the info panel that appears when you swipe down from the top of your iPhone's screen. As far as settings go, we've gone there and back again with Notifications and how it's listed: When iOS 7 launched, the Notifications section got a new name — Notification Center — but has now gone back to plain Notifications with iOS 8. (It's probably more fitting, as you monitor all of your notifications here, not just what is displayed in your Notification Center.)
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