how to change phone number is profile
I transferred data to a different iphone 8 plus (was my daughters phone) and her phone number is in my profile (settings/name/name, phone numbers, email/reachable at/edit). When I try to "add a phone number", my phone says a code will be sent to my number but it does not come through. This apparently needs to happen when the phone number is changed. I am thus unable to send group messages or messages with pictures or messages to anyone that doesn't have an iphone. I have restarted phone and checked all MMS & SMS settings.
iPhone 8 Plus, iOS 14