Should I be concerned?
I just got a message saying that my message save setting has been changed to forever because a new device was added. However. I only see my phones listed when I check settings. Should I be concerned?
iPhone 11, iOS 13
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Just change your password to a stronger one.
See here : Change your Apple ID password - Apple Support
To secure your Apple ID, add 2 factor authentication, read here: Two-factor authentication for Apple ID - Apple Support
FYI: Best you have at least 2 trusted phone numbers.