Hack
what do I do when I find out my iPhone has been hacked?
iPhone 7, iOS 13
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See:
If you think your Apple ID has been compromised https://support.apple.com/en-us/HT204145
Security and your Apple ID https://support.apple.com/en-us/HT201303
iCloud security overview https://support.apple.com/en-us/HT202303
Ways to keep your information safe on Mac https://support.apple.com/en-gb/guide/mac-help/mh11402/mac