Re: app permissions
To provide a little more detail to dz-015's answer, on iOS 9 under Settings>Privacy you can individually control each apps access to
location services, contacts, calendars, reminders, photos, Bluetooth sharing, microphone, camera, HomeKit, media library and motion & fitness.
Unfortunately, iOS 9 does not allow users to completely disable internet access to specific apps. I don't want shopping list, to do list or calculator apps to have internet access. My solution is I don't buy apps.