Apple iPhone 17
Help and Support for

Apple iPhone 17

iOS 26

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My Apple iPhone 17 iOS 26 uses a large amount of mobile data

Cause 1 of 7: Use of mobile data for applications is turned on

If mobile data usage for applications is turned on, the applications will use mobile data when your phone is not connected to a Wi-Fi network.

Solution: Turn off mobile data usage for applications.

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