Hi my son sold his iphone 6plus, he factory reset it and removed his apple id on to his new phone, but the old phone the new owner cant access it as a old apple I'd still on from years ago and my son has forgotten his iCloud password and its linked to an old phone number which no long exist how can we sort this
iPhone 8 Plus, iOS 13
See if you can get an email option.
Enter the Apple (iCloud) ID and click Forgot Password.
If necessary, contact Apple ID Support.
Apple Support by e-mail or chat Work through the screens to get a chat option.
Or fill out and submit this form. The form is for iTunes, but it will get passed to the ID Support section.
From the 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.
Getting rid of apple id
