Deregister iMessage number

Welcome to the Apple Support Communities.

See: Deregister iMessage on your iPhone or online - Apple Support.

Jack

Pmashndash wrote:

I no longer have the device with the number I’m trying to deregister. so that does not help.

You need to read the article. See the section titled "Deregister iMessage online".

Can you deselect it from Settings > Messages > Send & Receive?

Pmashndash wrote:

It’s still telling me to put the phone number in that don’t have anymore

If you don't have the phone number, why do you need to deregister iMessage?

If it still shows up in settings, just "un-check" it from Settings > Messages > Send & Receive.

Pmashndash wrote:

It’s not on there only in my names, phone numbers, and emails

I'm confused. So why does it need to be deregistered?