These are instructions on how to untrust a computer from your iPhone preventing it from being able to sync with your device, create backups, and access your photos, videos, contacts, and other content.
Unfortunately, Apple does not provide a way to untrust just one computer so taking this step will untrust all computers that have been trusted. It will also reset your Location & Privacy settings, meaning that some apps will once again ask for permission to access certain information.
Tap to launch Settings from your SpringBoard.
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