How would I know if someone else has access to my phone or account
How I know if someone else has access to my phone or account
iPhone SE, iOS 14
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You don't know if someone has access to your device or ID unless the sign in somewhere.
Check your Apple ID device list to see where you're signed in - Apple Support
As a precaution, change your password.
What to do after you change your Apple ID or password - Apple Support I suggest doing this before you change your Apple ID or password.