How do I maximize my privacy in iOS 8?
Go to Settings → Privacy and you can find a wealth of information and options available.


Location Services

This option shows you a list of all the apps that are using location information on your device, regardless of purpose.

There is a killswitch at the top allowing you to completely disable location services throughout the device, for both third-party apps and system services (available at the bottom).
Contacts, Calendars, Reminders, Photos, Bluetooth Sharing, Microphone and  Motion Activity

These categories are all very similar and give you the ability to grant/remove the permission from all apps installed on your device. System apps can't be prevented from accessing the data though—you can't prevent the iOS Photos app from accessing Photos for example, but you can prevent third-party apps.
Twitter and Facebook

These categories allow you to prevent apps' access to your Twitter and Facebook accounts, should you have logged in with these accounts on your device.
Finally, Advertising

This category allows you to limit Ad Tracking as well as reset your Advertising Identifier, which should be self-explanatory.


You can prevent automatic downloads by going to Settings → iTunes &amp; App Store and disabling automatic downloads for the various categories, including updates.