Apps, even if not used often, may be running in the background and downloading data.
If an app cannot be uninstalled, you can disable it.
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Go to Settings. See
Getting to know your settings.
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Tap
Apps & notifications.
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At the bottom of
Recently opened apps, choose to see all apps.
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Tap the app, and then tap
Disable.
Tip: You can also press and hold an app on the
Home screen or
Apps screen, tap
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, and then tap
Disable.