Lost iPhone-Forgot Apple ID email

You can find out which Apple ID has been used:

If you forgot your Apple ID email address or phone number - Apple Support

And the password can be reset as well:

If you forgot your Apple ID password - Apple Support

Sorry, but the phone number can not be used to retrieve the Apple ID.

Did you check the emails from Apple, which also should contain the Apple ID info?

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copied from: If you forgot your Apple ID email address or phone number - Apple Support