Privacy controls in iOS 8 and later give you control over which apps have access to information stored on your iOS device. For example, you can allow a social-networking app to use your camera, allowing you to take and upload pictures. You can also grant access to your contacts, so a messaging app can find any friends that are already using the same app.
You can modify privacy settings in Settings > Privacy. You can select a type of data from this list to see which apps have asked for permission to use that data. An app won't appear on the list until it asks permission to use your data. You can add or remove permission from any app that has asked for access to data. An app can use your data only if you have given it your permission.
How your iOS device uses Location Services
With your permission, Location Services allows apps and websites (including Maps, Camera, Weather, and other apps) to use information from cellular1, Wi-Fi2, Global Positioning System (GPS)3 networks, and Bluetooth4 to determine your approximate location5.
Apps that can show your location on the screen, including Maps, show your current (approximate) location using a blue marker. If your location can't be determined precisely, you'll see a blue circle around the marker. The size of the circle shows how precisely your location can be determined—the smaller the circle, the greater the precision.
When Location Services is active, a black or white arrow icon appears in the status bar.
Maps, directions, and location-based apps depend on data services. These data services are subject to change and might not be available in all geographic areas, resulting in maps, directions, or location-based information that might be unavailable, inaccurate, or incomplete. Compare the information provided on the device to your surroundings and defer to posted signs to resolve any discrepancies.
Learn more about how Apple and third-party apps use Location Services.
Give apps permission to use your Location
The first time an app tries to access your location, even in the background, it will ask for your permission. You'll see which app is asking for permission to use your location, and the app's developer may also explain how their app uses your location.
Some apps will ask to use your location only while the app is in use. An app is considered "in use" when you're actively using it in the foreground, or when it's in use in the background, which the status bar will indicate.
Other apps will ask for access to your location even when the app isn't in use. When you allow an app to always use your location, iOS will remind you which apps are able to use your location after an app uses your location in the background.
Turn Location Services on or off
You can turn Location Services on or off at Settings > Privacy > Location Services. You can turn Location Services on either during the Setup Assistant process or later through the Location Services setting. You can individually control which apps and system services have access to Location Services data. When Location Services are off, apps can't use your location in the foreground or background. This will limit the performance of various Apple and third-party apps.
Settings > Privacy > Location Services.
Settings > Privacy > Location Services > System Services.
Learn more about Location Services and Privacy.
Reset or disable Location Services
Location warnings are the requests that apps (such as Camera, Compass, and Maps as well as location-based third-party apps) make to use Location Services with those apps. An app will ask for permission the first time it needs to access Location Services data. Tapping Allow will give that app permission to use Location Services as needed. Tapping Don't Allow will prevent an app from accessing Location Services data. Apps won't use your location until they have asked for your permission and you grant permission.
If you would like to reset all of your location settings to the factory default, go to Settings > General > Reset and tap Reset Location & Privacy. When your location and privacy settings are reset, apps will stop using your location until you grant them permission.
Improve GPS accuracy
GPS accuracy depends on the number of visible GPS satellites. Locating all visible satellites can take several minutes, with accuracy gradually increasing over time. To improve GPS accuracy:
- Make sure that you've set the date, time, and time zone correctly on the device in Settings > General > Date & Time. If possible, use Set Automatically.
- Keep a clear view in several directions. Walls, vehicle roofs, tall buildings, mountains, and other obstructions can block line of sight to GPS satellites. When this happens, your device uses Wi-Fi or cellular networks to determine your position until the GPS satellites are visible again.
Crowd-sourced Wi-Fi and cellular Location Services
If Location Services is on, your device will periodically send the geo-tagged locations of nearby Wi-Fi hotspots and cell towers to Apple to augment Apple's crowd-sourced database of Wi-Fi hotspot and cell tower locations. If you're traveling (for example, in a car) and Location Services is on, a GPS-enabled iOS device will also periodically send GPS locations and travel speed information to Apple to be used for building up Apple's crowd-sourced road-traffic database. The crowd-sourced location data gathered by Apple is anonymous and encrypted. It doesn't personally identify you.
Learn more about Location Services and Privacy.
About your location during emergency calls
For safety purposes, your iPhone’s location information may be used when you place an emergency call to aid response efforts regardless of whether you enable Location Services.
1. iPad (Wi-Fi + Cellular models): Make sure that Cellular Data is on in Settings > Cellular > Cellular Data, even if you're not subscribed to a cellular data plan. This will allow your device to more accurately calibrate itself using network time and location information. In some instances, disabling a SIM PIN may be necessary.
2. iOS devices sold in China may use the term Wireless LAN (WLAN) instead of Wi-Fi. Not all China iPhone models support WLAN.
3. GPS is available on iPhone and iPad Wi-Fi + Cellular models.
4. Bluetooth interacts with iBeacons to provide a way to create and monitor areas that advertise certain identifying information.
5. iOS devices without a cellular connection use only Wi-Fi for Location Services (if a Wi-Fi network is available). Some third-party apps rely on a Wi-Fi connection for region monitoring. If a device is passcode locked, this feature may be limited or inaccurate.