How to untrust a device on iphone
How do i untrust a device
iPhone 12 Pro
Question marked as
Top-ranking reply
You'll need to reset the trust settings for everything you've ever connected and then individually set again for devices you want to trust individually when you connect to them.
About the 'Trust This Computer' alert on your iPhone, iPad, or iPod touch - Apple Support
Change your settings for trusted computers
Your device remembers the computers you've chosen to trust.
If you don't want to trust a computer or other device anymore, change the privacy settings on your iPhone, iPad, or iPod touch. Go to Settings > General > Reset > Reset Location & Privacy. Now when you connect to formerly trusted computers, the Trust alert will ask you whether you trust that computer.