I do not want other devices to have access to my phone
I want to turn off all syncing that could be available on other devices particularly laptops since I do not own any
iPhone 12, iOS 16
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See -> Check your Apple ID device list to see where you're signed in
Check your Apple ID device list to find where you're signed in - Apple Support
- if you see devices that don't belong to you (anymore), delete from your account.