How to ‘UnTrust’ All Computers from iPhone & iPad

How to Reset the “Trust This Computer” Alert and UnTrust All Computers from iOS

This resets all trusted computers from any iPhone, iPad, or iPod touch running iOS 8 or later:

1. Open the Settings app on the iPhone, iPad, or iPod touch
2. Go to “General” then to “Reset”
3. Tap on “Reset Location & Privacy”, enter the devices passcode, and confirm that you wish to reset all location and privacy settings on the iOS device
4. Exit out of Settings when complete (perhaps after you reconfigure the location and privacy customizations you had prior to the reset)