Settings is THE most important app on the iPhone. If you wish to change anything on your phone, this is the easiest way to do it. Settings is divided into many tabs. Here, in top-to-bottom order of how they appear, are what they do:
Airplane Mode Edit
Airplane Mode is pretty self-explanatory. You tap it, the button goes green, and all cellular and Bluetooth services shut off instantly. Tap the button again and they'll turn back on.
NOTE: WiFi still works with Airplane Mode on! Though it automatically shuts itself off when the mode is activated, you are able to reactivate it with Airplane Mode still in effect.
Conveniently placed directly under Airplane Mode, the WiFi tab doesn't let you do much. In it, you can activate and deactivate WiFi, choose the WiFi network you want to use and choose to forget a certain network, which simply means it doesn't become your automatic service and you have to put the password in again if you want to use it once more. The Forget This Network feature is relatively useless unless you're in a situation like at the schools in WWP, where the WiFi blocks half the possible tabs and, if the cell service is decent enough, actually slows you down.
I won't go into depth as to what Bluetooth does, since you can visit the Bluetooth page for that. The tab, on the other hand, I will describe. It is very similar to the WiFi tab. You have the ability to activate and deactivate it and you can choose a device to link with. Like WiFi networks, there is also a Forget this Device option if you click on them.
This tab is a little more complicated than the other three so far. When clicked on, the first option, like WiFi and Bluetooth, is to activate or deactivate cellular data. You can then activate or deactivate roaming, which is a service that allows your phone to activate to towers not owned by your provider (in my case, that would be Verizon). Next, you can access the Personal Hotspot tab that can also be accessed in the main Settings menu, so why you would go to the Cellular tab just to click on another tab is beyond me. It then tells you how much time you've spent calling during your month-long period (Apple's wording, not mine) and how much data you've used. Below that are a list of all the apps that could use cell service and a button to activate or deactivate cellular service usage for that app.
Personal Hotspot Edit
In case you don't know what Personal Hotspot is, it is a cellular feature that enables other devices with the password to use your cell service like a WiFi router. If another device is using it, a blue bar will pop up at the top of your screen stating that. In this tab, you have the ability to activate or deactivate it (should I start copy-and-pasting these words instead?) and change the password required to access it. As stated in the Cellular section, the Personal Hotspot tab can also be accessed from the Cellular tab.
NOTE: I strongly recommend only using hotspot when it is of the utmost necessity, since it swiftly uses up your service while in use.
In this tab you can pretty much only do two things. The first part of the tab lists all the apps with the ability to notify you, and then you can click on each individual app and (shocker) activate or deactivate notifications as well as modify the type of notification you get (does it make a sound, is it a banner or an alert, does it show in the lock screen, etc.). The second part gives you the ability to activate or deactivate AMBER and Emergency alerts.
Control Center Edit
Like Bluetooth, there is another page for the actual Control Center, so this is just about the tab. In it, you can allow the control center to be accessed or not in your lock screen and again from within apps.
Do Not Disturb Edit
Activating Do Not Disturb serves one purpose: it prevents all notifications, including texts and calls, from alerting you. You still receive them, they just don't cause an alert. The first option is to activate or deactivate it. Next, it allows you to set a certain time when this feature should activate. Then, you can allow calls to come in from everyone or from your Favorites while the feature is activated. Then, Repeated calls, as in someone calling you a second time in three minutes, do notify you or not, then you can choose whether Do Not Disturb is always active (when activated) or whether it is only active when the phone is locked.
This tab is so extensive that it's getting a page of its own.
Display and Brightness Edit
The first option is not to activate and deactivate it, probably much to Apple's chagrin, since you can't deactivate brightness. Instead, you are able to move a dot back and forth to make the phone brighter or dimmer. Moving it to the left dims the screen, and moving it to the right brightens the screen. Underneath that is the ability to activate or deactivate (they had to get it in somewhere) auto-brightness, which allows the phone to adjust its brightness for you depending on the brightness of the area (dimmer rooms lead to a dimmer phone). You can then activate Night Shift, which enables the phone to automatically change the tone of the light at a set time of night. Next, in the Display section, you are able to change the size of the words on the phone with a dragging dot, also with left making the words smaller and right making them bigger. You can also embolden the text. You can then modify the View of the phone, leaving it as is or making it zoom in on the apps.
Wallpaper is pretty self-explanatory. It allows you to choose a photo from your camera roll and make it your lock screen, home screen or both.
NOTE: wallpapers zoom in, so some of the photo will be cropped out to fit on the phone
Sounds and Haptics Edit
First, you can choose to activate or deactivate (oh Apple) vibrations when you're called. You then have a moving dot where you can choose to raise or lower the volume, and then an option to activate or deactivate the volume buttons. You can then modify the default ringtone and alert tones for texts and various notifying apps (such as Facebook). You can then activate or deactivate the clicking sound of the keyboard (or as Baba would call it, the typewriter) and the locking sound when the phone is turned off.
Again, there's a page for Siri, so I won't explain its features here, just the tab. In the tab, the first thing you can do is (drumroll please) activate or deactivate it! You can then enable Siri to be active in the lock screen and activate or deactivate Hey Siri. Next up are the Siri Settings, in which you can change the language of Siri, change its accent (your only options are American, British and Australian) and its gender.
Touch ID & Passcode Edit
This page is nice and simple: it's all about accessing your phone. To access it, you do have to put in the password used on your phone. Then, you have a series of settings recording the Touch ID. You can activate or deactivate (yippee) the usage of Touch ID for three things: unlocking the phone, paying using Apple Pay and purchasing items on iTunes or on the App Store. You can then input new fingerprints or delete old ones. You can then activate or deactivate your passcode, as well as change your passcode to a new set of numbers and (if you want) letters. Then there's Voice Dial, which enables you to speak your passcode. Lastly, you can allow or prohibit a series of things from being accessed by the lock screen: Today View, Notifications, Siri, replying to messages, Home Control (add-on that we can't really use) and the Wallet. Last on the list in this tab is the ability to cause the phone to erase all of its data upon the tenth failed entry of the passcode.
First up in the Battery tab is Low Power Mode. Low Power Mode is a setting in which the phone automatically dims and it shuts itself off after a minute of not using it, effectively saving battery. Next is the ability to activate or deactivate the Battery Percentage, which is what shows you the percentage of battery life remaining. Next it the ability to set an Auto-Lock, which, like Low Power Mode, automatically shuts off your phone after a set interval of time (ranging from 30 seconds to five minutes, if activated at all). Next is the Reduce Brightness option, which simply brings you to the Display and Brightness tab. Last is the Battery Usage section, which shows you how much of your battery lost was drained, in percentage, by each app and, if activated, how much time was spent on the app. Lastly are two more lines showing you how much time was spent on the phone since it was 100% and how long it had been since it was last plugged into a charger.
The privacy tab is simple. It brings you to a list of features on your phone such as the Contacts, Camera and Microphone. If you click on it, you are shown a subsequent list of apps that are using or have requested to use that feature. You can then activate or deactivate the use of that feature with that app. Then comes Analytics, which enables you to activate or deactivate the sharing of your data with different sources (I think) and Advertising, which leads to ads being targeted to your interests.
iTunes and App Stores Edit
First thing in this tab is the ability to change your apple id. Next you can activate or deactivate automatic downloads of music, apps or updates. Lastly, you can activate or deactivate the use of cellular data for downloading apps if need be.
Wallet and Apple Pay Edit
First up in this tab is where you can change what credit cards you use on your phone for purchases. Next, you can activate or deactivate the ability to access your credit cards by double-clicking on the Home Button and the ability to use Apple Pay for payments on your computer. Lastly, you can change what card you use primarily, your shipping address, email for billing and phone number for billing.
Under all of that is a tab for every app on your phone and their respective settings. They're divided into two sections: apps placed onto your phone by Apple and apps you download yourself.