Change iPhone number in messages
How do I use a different iPhone # for “my messages” iPad app"
iPhone 6 Plus, iOS 12
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Is the phone number you want to change to, your iPhone phone number? As long as it's an iPhone, this link will help: Add or remove your phone number in Messages or FaceTime - Apple Support
If however, you are trying to change the number to something not associated with an iPhone, you can only use an iOS based device for iMessage on iPad.
