Security lock
How do I unlock my iphone 12 without erasing the data?
iPhone 12
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Lock by what?
If you forgot your passcode, it will deletes your data and settings, see this Apple article: If you forgot your iPhone passcode
https://support.apple.com/en-us/HT204306
Have you forgotten your Apple ID?, check your Apple ID via your email box, see this Apple article: If you forgot your Apple ID
https://support.apple.com/en-us/HT201354
OR see -> Having trouble signing in?
https://iforgot.apple.com/password/verify/appleid