Child’s Apple ID
What if I would like to delete my child’s old Apple ID, but I forgot their password, and I don’t have the same phone number to try and access the Apple ID?
iPhone SE, iOS 15
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If you find you can’t sign in, reset your password, or receive verification codes, you can request account recovery ( How to use account recovery when you can’t reset your Apple ID password - Apple Support ) to regain access to your account. Account recovery might take a few days or longer, depending on the specific account information you can provide to verify your identity.