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Apple iPhone 6s
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My mobile phone uses a large amount of mobile data
This troubleshooting guide will take you through a number of possible causes
to help you find a solution to your problem.
Turn off mobile data usage for iCloud Drive.

1. Tap Settings.

2. Tap iCloud.

3. Tap iCloud Drive.

4. Tap the indicator next to "iCloud Drive" to turn file synchronisation on or off.

5. Tap the indicator next to "Use Mobile Data" to turn file synchronisation via the mobile network on or off.

6. Tap arrow left.

7. Tap Photos.

8. Tap the indicator next to "iCloud Photo Library" to turn the function on or off.

9. Tap the indicator next to "Upload to My Photo Stream" to turn the function on or off.

10. Tap arrow left.

11. Tap the indicator next to the required data type to turn synchronisation on or off.

12. Tap the Home key to return to the home screen.
Possible cause 1:
Mobile data usage for iCloud Drive is turned on
Solution:
Turn off mobile data usage for iCloud Drive.