How to deregister from iMessage without phone and Sim Card?
After handing in my phone and Sim Card iMessages are still send out with the old phone number. I cannot deregister without a phone and Sim Card. Any advise
iPhone 8 Plus, iOS 13
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If the below doesn't work because you can't receive the code, contact Apple ID Support.
iMessage on your iPhone or online - Deregister
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.