Unable to use phone number for Apple ID
How do I fix the error “Cannot verify phone number; This phone number is already in use with another account.” This is my only Apple ID and I don’t know how it’s on a different account when it’s my own number
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Someone else might have the phone number added to their account. Contact Apple ID Support for assistance. See the Apple Support articles below for contact information.
Apple ID - Official Apple Support. -
Contact Apple for help with Apple ID account security - Apple Support. * (Link doesn’t always load)
Get Support - Work through the screens to get a chat option. You may have to pick a slightly different problem.
Apple Support schedule phone call. -
From the Apple Support article below.
Without proof of your identity via security questions and other carefully selected criteria, Apple Support can't help you reset a password or perform any other actions on your account. These policies are audited and reviewed on a regular basis.