Help article
How to prevent bundled offers from starting prematurely on Apple devices
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Apple may occasionally use a small amount of your mobile data when installing apps. To prevent apps from launching prematurely, it's recommended to disable Wi-Fi Assist.
On iOS devices, a default setting can cause apps to open even before you've enabled it in your settings.
This setting only activates when the Wi-Fi connection is weak and automatically deactivates as soon as a more reliable connection is detected.
To adjust this setting, go to the bottom of the "Mobile Services" section in your settings.