My iPhone showed a Locked to Owner message even though I hadn't reset it or marked it as lost. I entered my Apple Account password and it unlocked, with my apps and data still there. What could cause that, and should I be worried?
Why did my iPhone suddenly say Locked to Owner?
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That screen relates to Activation Lock, which ties the phone to an Apple Account. Seeing it unexpectedly doesn't necessarily mean someone marked the phone as lost or that your data was erased.
There have been reports of it appearing after software updates, possibly because of an activation server response. That's one possible explanation, but the message alone doesn't establish what caused it on your phone.
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Since your own account unlocked it and everything is still there, I'd keep an eye on it rather than reset the phone. If it happens again, note when it happened and whether there was a recent update, then contact Apple Support with those details.
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A quick account check wouldn't hurt. Look at the devices signed in to your Apple Account and make sure you recognize them. If anything looks unfamiliar, change your password and make sure two-factor authentication is enabled.
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Jumblet.8c:
The lock screen by itself isn't proof that someone accessed the account, though. The device check is just a precaution.