And that is what worked.The issue is that the phone number has to be accompanied by an account number, and if the corporate association is Telus, it needed my Telus account number (from 2019!) to work.So while I can see how it would be the case that ...
The new carrier is getting an error message that the number is not a Public Mobile number, and have counselled me that I need to sort that out with Public Mobile.So I'm trying to do that. Thank you!